EP2258838A1 - Protéases de Nocardiopsis - Google Patents
Protéases de Nocardiopsis Download PDFInfo
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- EP2258838A1 EP2258838A1 EP10180249A EP10180249A EP2258838A1 EP 2258838 A1 EP2258838 A1 EP 2258838A1 EP 10180249 A EP10180249 A EP 10180249A EP 10180249 A EP10180249 A EP 10180249A EP 2258838 A1 EP2258838 A1 EP 2258838A1
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- Prior art keywords
- polypeptide
- protease
- nucleic acid
- seq
- acid sequence
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/48—Hydrolases (3) acting on peptide bonds (3.4)
- C12N9/50—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
- C12N9/52—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from bacteria or Archaea
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
- A23J3/00—Working-up of proteins for foodstuffs
- A23J3/30—Working-up of proteins for foodstuffs by hydrolysis
- A23J3/32—Working-up of proteins for foodstuffs by hydrolysis using chemical agents
- A23J3/34—Working-up of proteins for foodstuffs by hydrolysis using chemical agents using enzymes
- A23J3/346—Working-up of proteins for foodstuffs by hydrolysis using chemical agents using enzymes of vegetable proteins
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/10—Organic substances
- A23K20/189—Enzymes
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K50/00—Feeding-stuffs specially adapted for particular animals
- A23K50/30—Feeding-stuffs specially adapted for particular animals for swines
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K50/00—Feeding-stuffs specially adapted for particular animals
- A23K50/60—Feeding-stuffs specially adapted for particular animals for weanlings
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K50/00—Feeding-stuffs specially adapted for particular animals
- A23K50/70—Feeding-stuffs specially adapted for particular animals for birds
- A23K50/75—Feeding-stuffs specially adapted for particular animals for birds for poultry
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/38—Products with no well-defined composition, e.g. natural products
- C11D3/386—Preparations containing enzymes, e.g. protease or amylase
- C11D3/38609—Protease or amylase in solid compositions only
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/38—Products with no well-defined composition, e.g. natural products
- C11D3/386—Preparations containing enzymes, e.g. protease or amylase
- C11D3/38618—Protease or amylase in liquid compositions only
Definitions
- the present invention relates to isolated polypeptides having protease activity and isolated nucleic acid sequences encoding the polypeptides.
- the invention also relates to nucleic acid constructs, vectors, and host cells, including plant and animal cells, comprising the nucleic acid sequences, as well as methods for producing and using the polypeptides, in particular the use of the polypeptides in animal feed, and detergents.
- Proteases derived from Nocardiopsis sp. NRRL 18262 and Nocardiopsis dassonvillei NRRL 18133 are disclosed in WO 88/03947 .
- the DNA and amino acid sequences of the protease derived from Nocardiopsis sp. NRRL 18262 are shown in DK application no. 1996 00013 .
- WO 01/58276 discloses the use in animal feed of acid-stable proteases related to the protease derived from Nocardiopsis sp. NRRL 18262, as well as a protease derived from Nocardiopsis alba DSM 14010.
- JP 2-255081-A discloses a protease derived from Nocardiopsis sp. strain OPC-210 (FERM P-10508), however without sequence information. The strain is no longer available, as the deposit was withdrawn.
- DD 200432 8 discloses a proteolytic preparation derived from Nocardiopsis dassonvillei strain ZIMET 43647, however without sequence information. The strain appears to be no longer available.
- JP 2003284571-A discloses the amino acid sequence and the corresponding DNA sequence of a protease derived from Nocardiopsis sp. TOA-1 (FERM P-18676). The sequence has been entered in GENESEQP with no. ADF43564.
- proteases were cloned, purified and characterized. These proteases are designated as follows: Protease L1a derived from Nocardiopsis josonvillei subsp. josonvillei DSM 43235 (see SEQ ID NOs. 1 and 2); protease L1b derived from Nocardiopsis prasina DSM 15649 (see SEQ ID NOs: 3 and 4); protease L1c derived from Nocardiopsis prasina (previously alba ) DSM 14010 (see SEQ ID NOs: 5 and 6); protease L2a derived from Nocardiopsis sp.
- DSM 16424 see SEQ ID NOs: 7 and 8
- protease L2b derived from Nocardiopsis alkaliphila DSM 44657
- protease L2c derived from Nocardiopsis lucentensis DSM 44048 (see SEQ ID NOs: 11 and 12).
- the invention relates to an isolated polypeptide having protease activity, selected from the group consisting of: (a) a polypeptide having an amino acid sequence which has a degree of identity to amino acids 1-192 of SEQ ID NO: 6 of at least 71.5%; (b) a polypeptide which is encoded by a nucleic acid sequence which hybridizes under very high stringency conditions with (i) nucleotides 574-1149 of SEQ ID NO:5, (ii) a subsequence of (i) of at least 100 nucleotides, and/or (iii) a complementary strand of (i), or (ii); (c) a variant of the polypeptide having an amino acid sequence of amino acids 1-192 of SEQ ID NO: 6 comprising a substitution, deletion, extension, and/or insertion of one or more amino acids; (d) an allelic variant of (a), or (b); and (e) a fragment of (a), (b), or (d) that has protea
- the present invention also relates to:
- the invention also relates to isolated nucleic acid sequences encoding the above polypeptides and to nucleic acid constructs, vectors, and host cells comprising the nucleic acid sequences as well as methods for producing and using the polypeptides, in particular within animal feed, and detergents.
- proteases Polypeptides having protease activity, or proteases, are sometimes also designated peptidases, proteinases, peptide hydrolases, or proteolytic enzymes.
- Proteases may be of the exo-type that hydrolyses peptides starting at either end thereof, or of the endo-type that act internally in polypeptide chains (endopeptidases). Endopeptidases show activity on N- and C-terminally blocked peptide substrates that are relevant for the specificity of the protease in question.
- protease is defined herein as an enzyme that hydrolyses peptide bonds. It includes any enzyme belonging to the EC 3.4 enzyme group (including each of the thirteen subclasses thereof).
- the EC number refers to Enzyme Nomenclature 1992 from NC-IUBMB, Academic Press, San Diego, California , including supplements 1-5 published in Eur. J. Biochem. 1994, 223, 1-5 ; Eur. J. Biochem. 1995, 232, 1-6 ; Eur. J. Biochem. 1996, 237, 1-5 ; Eur. J. Biochem. 1997, 250, 1-6 ; and Eur. J. Biochem. 1999, 264, 610-650 ; respectively.
- the nomenclature is regularly supplemented and updated; see e.g. the World Wide Web (WWW) at http://www.chem.qmw.ac.uk/iubmb/enzyme/index.html.
- Proteases are classified on the basis of their catalytic mechanism into the following groups: Serine proteases (S), Cysteine proteases (C), Aspartic proteases (A), Metallo proteases (M), and Unknown, or as yet unclassified, proteases (U), see Handbook of Proteolytic Enzymes, A.J.Barrett, N.D.Rawlings, J.F.Woessner (eds), Academic Press (1998 ), in particular the general introduction part.
- S Serine proteases
- C Cysteine proteases
- A Aspartic proteases
- M Metallo proteases
- U Unknown, or as yet unclassified, proteases
- proteases of the invention and for use according to the invention are selected from the group consisting of:
- protease For determining whether a given protease is a Serine protease, and a family S2A protease, reference is made to the above Handbook and the principles indicated therein. Such determination can be carried out for all types of proteases, be it naturally occurring or wild-type proteases; or genetically engineered or synthetic proteases.
- Protease activity can be measured using any assay, in which a substrate is employed, that includes peptide bonds relevant for the specificity of the protease in question.
- Assay-pH and assay-temperature are likewise to be adapted to the protease in question. Examples of assay-pH-values are pH 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12. Examples of assay-temperatures are 30, 35, 37, 40, 45, 50, 55, 60, 65, 70, 80, 90, or 95°C.
- protease substrates examples include casein, such as Azurine-Crosslinked Casein (AZCL-casein).
- AZCL-casein Azurine-Crosslinked Casein
- pNA Assay a preferred assay.
- protease includes not only natural or wild-type proteases obtained from microorganisms of any genus, but also any mutants, variants, fragments etc. thereof exhibiting protease activity, as well as synthetic proteases, such as shuffled proteases, and consensus proteases.
- Such genetically engineered proteases can be prepared as is generally known in the art, e.g. by Site-directed Mutagenesis, by PCR (using a PCR fragment containing the desired mutation as one of the primers in the PCR reactions), or by Random Mutagenesis. The preparation of consensus proteins is described in e.g. EP 897985 .
- Gene shuffling is generally described in e.g. WO 95/22625 and WO 96/00343 . Recombination of protease genes can be made independently of the specific sequence of the parents by synthetic shuffling as described in Ness, J.E. et al, in Nature Biotechnology, Vol. 20 (12), pp. 1251-1255, 2002 . Synthetic oligonucleotides degenerated in their DNA sequence to provide the possibility of all amino acids found in the set of parent proteases are designed and the genes assembled according to the reference. The shuffling can be carried out for the full length sequence or for only part of the sequence and then later combined with the rest of the gene to give a full length sequence.
- proteases of SEQ ID NOs: 2, 4, 6, 8, 10, and 12, as well as the Nocardiopsis proteases described in the prior documents listed above, are particular examples of such parent proteases which can be subjected to shuffling as described above, to provide additional proteases of the invention.
- the term "obtained from” as used herein in connection with a given source shall mean that the polypeptide encoded by the nucleic acid sequence is produced by the source or by a cell in which the nucleic acid sequence from the source is present. In a preferred embodiment, the polypeptide is secreted extracellularly.
- the protease is a low-allergenic variant, designed to invoke a reduced immunological response when exposed to animals, including man.
- the term immunological response is to be understood as any reaction by the immune system of an animal exposed to the protease.
- One type of immunological response is an allergic response leading to increased levels of IgE in the exposed animal.
- Low-allergenic variants may be prepared using techniques known in the art.
- the protease may be conjugated with polymer moieties shielding portions or epitopes of the protease involved in an immunological response. Conjugation with polymers may involve in vitro chemical coupling of polymer to the protease, e.g.
- Conjugation may in addition or alternatively thereto involve in vivo coupling of polymers to the protease.
- Such conjugation may be achieved by genetic engineering of the nucleotide sequence encoding the protease, inserting consensus sequences encoding additional glycosylation sites in the protease and expressing the protease in a host capable of glycosylating the protease, see e.g. WO 00/26354 .
- Another way of providing low-allergenic variants is genetic engineering of the nucleotide sequence encoding the protease so as to cause the proteases to self-oligomerize, effecting that protease monomers may shield the epitopes of other protease monomers and thereby lowering the antigenicity of the oligomers.
- Such products and their preparation is described e.g. in WO 96/16177 .
- Epitopes involved in an immunological response may be identified by various methods such as the phage display method described in WO 00/26230 and WO 01/83559 , or the random approach described in EP 561907 .
- an epitope Once an epitope has been identified, its amino acid sequence may be altered to produce altered immunological properties of the protease by known gene manipulation techniques such as site directed mutagenesis (see e.g. WO 00/26230 , WO 00/26354 and/or WO 00/22103 ) and/or conjugation of a polymer may be done in sufficient proximity to the epitope for the polymer to shield the epitope.
- site directed mutagenesis see e.g. WO 00/26230 , WO 00/26354 and/or WO 00/22103
- conjugation of a polymer may be done in sufficient proximity to the epitope for the polymer to shield the epitope.
- the various aspects of the present invention relate to isolated polypeptides having protease activity (for short "proteases"), as well as the corresponding isolated nucleic acid sequences, said polypeptides, or nucleic acids, respectively, comprising an amino acid sequence, or a nucleic acid sequence, respectively, having a certain degree of identity to a specified fragment of an amino acid sequence, or a nucleic acid sequence, respectively, with a specified SEQ ID NO.
- the fragments specified correspond to the mature polypeptides, or the mature polypeptide encoding parts of the nucleic acid sequences, respectively.
- the degree of identity between two amino acid sequences, as well as the degree of identity between two nucleotide sequences, is determined by the program "align" which is a Needleman-Wunsch alignment (i.e. a global alignment).
- the program is used for alignment of polypeptide, as well as nucleotide sequences.
- the default scoring matrix BLOSUM50 is used for polypeptide alignments, and the default identity matrix is used for nucleotide alignments.
- the penalty for the first residue of a gap is -12 for polypeptides and -16 for nucleotides.
- the penalties for further residues of a gap are -2 for polypeptides, and -4 for nucleotides.
- FASTA is part of the FASTA package version v20u6 (see W. R. Pearson and D. J. Lipman (1988), “Improved Tools for Biological Sequence Analysis", PNAS 85:2444-2448 , and W. R. Pearson (1990) "Rapid and Sensitive Sequence Comparison with FASTP and FASTA," Methods in Enzymology 183:63- 98 ).
- FASTA protein alignments use the Smith-Waterman algorithm with no limitation on gap size (see “ Smith-Waterman algorithm”, T. F. Smith and M. S. Waterman (1981) J. Mol. Biol. 147:195-197 ).
- the polypeptide of the invention has a degree of identity to the mature parts of either of SEQ ID NOs: 2, 4, 6, 8, 10, or 12 of at least 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or at least 99%.
- the nucleic acid sequence of the invention has a degree of identity to the mature peptide encoding part of either of SEQ ID NOs: 1, 3, 5, 7, 9, or 11 of at least 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or at least 99%.
- the protease of the invention has an amino acid sequence that differs by (i) no more than twenty, nineteen, eighteen, seventeen, sixteen, fifteen, fourteen, thirteen, twelve, or no more than eleven amino acids; (ii) no more than ten, nine, eight, seven, six, five, four, three, two, or no more than one amino acid; (iii) ten, or by nine, or by eight, or by seven, or by six, or by five amino acids; or (iv) four, or by three, or by two amino acids, or by one amino acid from the mature parts of either of SEQ ID NOs: 2, 4, 6, 8, 10, and 12.
- the protease of the invention comprises the amino acid sequence of the mature parts of either of SEQ ID NOs: 2, 4, 6, 8, 10, or 12; or is an allelic variant thereof; or a fragment thereof that has protease activity.
- polypeptides of the present invention consist of the mature peptide part of either of SEQ ID NO: 2, 4, 6, 8, 10, or 12; or allelic variants thereof; or fragments thereof that have protease activity.
- a fragment of either of SEQ ID NOs: 2, 4, 6, 8, 10, or 12 is a polypeptide having one or more amino acids deleted from the amino and/or carboxyl terminus of these amino acid sequences.
- a fragment contains at least 75 amino acid residues, or at least 100 amino acid residues, or at least 125 amino acid residues, or at least 150 amino acid residues, or at least 160 amino acid residues, or at least 165 amino acid residues, or at least 170 amino acid residues, or at least 175 amino acid residues.
- allelic variant denotes any of two or more alternative forms of a gene occupying the same chromosomal locus. Allelic variation arises naturally through mutation, and may result in polymorphism within populations. Gene mutations can be silent (no change in the encoded polypeptide) or may encode polypeptides having altered amino acid sequences.
- An allelic variant of a polypeptide is a polypeptide encoded by an allelic variant of a gene.
- the present invention also relates to isolated polypeptides having protease activity and which are encoded by nucleic acid sequences which hybridize under very low, or low, or medium, or medium-high, or high, or very high stringency conditions with a nucleic acid probe which hybridizes under the same conditions with (a) either of SEQ ID NOs: 1, 3, 5, 7, 9, or 11, or the mature peptide encoding parts thereof; (b) a subsequence of (a), or (c) a complementary strand of (a), or (b) ( J. Sambrook, E.F. Fritsch, and T. Maniatis, 1989, Molecular Cloning, A Laboratory Manual, 2nd edition, Cold Spring Harbor, New York ).
- the nucleic acid probe is selected from amongst the nucleic acid sequences of (a), (b), or (c) above.
- the subsequence of (a) may be at least 100 nucleotides, or in another embodiment at least 200 nucleotides. Moreover, the subsequence may encode a polypeptide fragment that has protease activity.
- nucleic acid sequences of either of SEQ ID NOs: 1, 3, 5, 7, 9, or 11, or the mature peptide encoding parts thereof, or a subsequence thereof, as well as the amino acid sequences of either of SEQ ID NOs: 2, 4, 6, 8, 10, or 12, or a fragment thereof may be used to design a nucleic acid probe to identify and clone DNA encoding polypeptides having protease activity from strains of the same or different genera or species according to methods well known in the art.
- probes can be used for hybridization with the genomic or cDNA of the genus or species of interest, following standard Southern blotting procedures, in order to identify and isolate the corresponding gene therein.
- probes can be considerably shorter than the entire sequence, but should be at least 15, preferably at least 25, and more preferably at least 35 nucleotides in length. Longer probes can also be used. Both DNA and RNA probes can be used.
- the probes are typically labeled for detecting the corresponding gene (for example, with 32 P, 3 H, 35 S, biotin, or avidin). Such probes are encompassed by the present invention.
- genomic DNA or cDNA library prepared from such other organisms may be screened for DNA that hybridizes with the probes described above and which encodes a polypeptide having protease activity.
- Genomic or other DNA from such other organisms may be separated by agarose or polyacrylamide gel electrophoresis, or other separation techniques.
- DNA from the libraries or the separated DNA may be transferred to and immobilized on nitrocellulose or other suitable carrier material.
- the carrier material is used in a Southern blot.
- hybridization indicates that the nucleic acid sequence hybridizes to a labeled nucleic acid probe corresponding to the nucleic acid sequence shown in either of these SEQ ID NOs, its complementary strand, or a subsequence thereof, under very low to very high stringency conditions. Molecules to which the nucleic acid probe hybridizes under these conditions are detected using X-ray film.
- the nucleic acid probe is a nucleic acid sequence which encodes the mature peptide parts of either of SEQ ID NOs: 2, 4, 6, 8, 10, or 12, or subsequences thereof.
- the nucleic acid probe is those nucleotides of either of SEQ ID NOs: 1, 3, 5, 7, 9, or 11 that correspond to the mature polypeptide coding regions.
- very low to very high stringency conditions are defined as prehybridization and hybridization at 42°C in 5X SSPE, 0.3% SDS, 200 ⁇ g/ml sheared and denatured salmon sperm DNA, and either 25% formamide for very low and low stringencies, 35% formamide for medium and medium-high stringencies, or 50% formamide for high and very high stringencies, following standard Southern blotting procedures.
- the carrier material is finally washed three times each for 15 minutes using 2 x SSC, 0.2% SDS preferably at least at 45°C (very low stringency), more preferably at least at 50°C (low stringency), more preferably at least at 55°C (medium stringency), more preferably at least at 60°C (medium-high stringency), even more preferably at least at 65°C (high stringency), and most preferably at least at 70°C (very high stringency).
- the wash is conducted using either 0.2 X SSC, 0.1 X SSC or 0.02 X SSC, the other wash conditions being unamended (i.e.
- stringency conditions are defined as prehybridization, hybridization, and washing post-hybridization at 5°C to 10°C below the calculated T m using the calculation according to Bolton and McCarthy (1962, Proceedings of the National Academy of Sciences USA 48:1390 ) in 0.9 M NaCl, 0.09 M Tris-HCI pH 7.6, 6 mM EDTA, 0.5% NP-40, 1X Denhardt's solution, 1 mM sodium pyrophosphate, 1 mM sodium monobasic phosphate, 0.1 mM ATP, and 0.2 mg of yeast RNA per ml following standard Southern blotting procedures.
- the carrier material is washed once in 6X SSC plus 0.1% SDS for 15 minutes and twice each for 15 minutes using 6X SSC at 5°C to 10°C below the calculated T m .
- the present invention also relates to variants of the polypeptides comprising the mature parts of either of the amino acid sequences SEQ ID NOs: 2, 4, 6, 8, 10, or 12, and comprising a substitution, deletion, and/or insertion of one or more amino acids.
- the amino acid sequences of the variant polypeptides may differ from the amino acid sequence of the mature parts of either of SEQ ID NOs: 2, 4, 6, 8, 10, or 12, by an insertion or deletion of one or more amino acid residues and/or the substitution of one or more amino acid residues by different amino acid residues.
- amino acid changes are of a minor nature, that is conservative amino acid substitutions that do not significantly affect the folding and/or activity of the protein; small deletions, typically of one to about 30 amino acids; small amino- or carboxyl-terminal extensions, such as an amino-terminal methionine residue; a small linker peptide of up to about 20-25 residues; or a small extension that facilitates purification by changing net charge or another function, such as a poly-histidine tract, an antigenic epitope or a binding domain.
- conservative substitutions are within the group of basic amino acids (arginine, lysine and histidine), acidic amino acids (glutamic acid and aspartic acid), polar amino acids (glutamine and asparagine), hydrophobic amino acids (leucine, isoleucine and valine), aromatic amino acids (phenylalanine, tryptophan and tyrosine), and small amino acids (glycine, alanine, serine, threonine and methionine).
- basic amino acids arginine, lysine and histidine
- acidic amino acids glutmic acid and aspartic acid
- polar amino acids glutamine and asparagine
- hydrophobic amino acids leucine, isoleucine and valine
- aromatic amino acids phenylalanine, tryptophan and tyrosine
- small amino acids glycine, alanine, serine, threonine and methionine.
- the invention relates to a polypeptide having, or comprising, a sequence as set forth in either of SEQ ID NOs: 2, 4, 6, 8, 10, of 12, wherein conservative amino acid substitutions comprise replacements, one for another, among the basic amino acids (arginine, lysine and histidine), among the acidic amino acids (glutamic acid and aspartic acid), among the polar amino acids (glutamine and asparagine), among the hydrophobic amino acids (alanine, leucine, isoleucine and valine), among the aromatic amino acids (phenylalanine, tryptophan and tyrosine), and among the small amino acids (glycine, alanine, serine, threonine and methionine), or any combination thereof, or active fragments thereof.
- conservative amino acid substitutions comprise replacements, one for another, among the basic amino acids (arginine, lysine and histidine), among the acidic amino acids (glutamic acid and aspartic acid), among the polar amino acids (glut
- a polypeptide of the present invention may be a bacterial or fungal polypeptide.
- the fungal polypeptide may be derived from a filamentous fungus or from a yeast.
- the polypeptide of the invention is i) a bacterial protease; ii) a protease of the phylum Actinobacteria; iii) of the class Actinobacteria; iv) of the order Actinomycetales v) of the family Nocardiopsaceae; vi) of the genus Nocardiopsis ; and/or a protease derived from vii) Nocardiopsis species such as Nocardiopsis alba, Nocardiopsis alkaliphila, Nocardiopsis antarctica, Nocardiopsis prasina, Nocardiopsis composta, Nocardiopsis exhalans, Nocardiopsis halophila, Nocardiopsis halotolerans, Nocardiopsis kunsanensis, Nocardiopsis listeri, Nocardiopsis lucentensis, Nocardiopsis metallicus, Nocardiopsis synnemataformans, Nocardiopsis trehalosi, Nocardiopsis species
- the protease derives from Nocardiopsis alba, Nocardiopsis alkaliphila, Nocardiopsis dessertvillei, Nocardiopsis lucentensis, Nocardiopsis prasina, or Nocardiopsis sp.
- the invention encompasses both the perfect and imperfect states, and other taxonomic equivalents, e.g., anamorphs, regardless of the species name by which they are known. Those skilled in the art will readily recognize the identity of appropriate equivalents.
- ATCC American Type Culture Collection
- DSM Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH
- CBS Centraalbureau Voor Schimmelcultures
- NRRL Northern Regional Research Center
- polypeptides may be identified and obtained from other sources including microorganisms isolated from nature (e.g., soil, composts, water, etc.) using the above-mentioned probes. Techniques for isolating microorganisms from natural habitats are well known in the art.
- the nucleic acid sequence may then be derived by similarly screening a genomic or cDNA library of another microorganism. Once a nucleic acid sequence encoding a polypeptide has been detected with the probe(s), the sequence may be isolated or cloned by utilizing techniques which are known to those of ordinary skill in the art (see, e.g ., Sambrook et al., 1989, supra ).
- an "isolated" polypeptide is a polypeptide which is essentially free of other non-protease polypeptides, e.g ., at least about 20% pure, preferably at least about 40% pure, more preferably about 60% pure, even more preferably about 80% pure, most preferably about 90% pure, and even most preferably about 95% pure, as determined by SDS-PAGE.
- Polypeptides encoded by nucleic acid sequences of the present invention also include fused polypeptides or cleavable fusion polypeptides in which another polypeptide is fused at the N-terminus or the C-terminus of the polypeptide or fragment thereof.
- a fused polypeptide is produced by fusing a nucleic acid sequence (or a portion thereof) encoding another polypeptide to a nucleic acid sequence (or a portion thereof) of the present invention.
- Techniques for producing fusion polypeptides are known in the art, and include ligating the coding sequences encoding the polypeptides so that they are in frame and that expression of the fused polypeptide is under control of the same promoter(s) and terminator.
- the polypeptides of the invention are acid-stable.
- the term acid-stable means that the residual activity after 2 hours of incubation at pH 2.0, pH 2.5 or pH 3.0 and 37°C, is at least 50%, as compared to the residual activity of a corresponding sample incubated for 2 hours at pH 9.0 and 5°C.
- the residual activity is at least 55%, 60%, 65%, 70%, 75%, 80%, 85%, or at least 90%.
- a suitable assay for determining acid-stability is the pH-stability assay of Example 2.
- the polypeptides of the invention are alkali-stable.
- alkali-stable means that the residual activity after 2 hours of incubation at pH 12.0 and 37°C, is at least 85%, as compared to the residual activity of a corresponding sample incubated for 2 hours at pH 9.0 and 5°C.
- the residual activity is at least 86%, 87%, 88%, 89%, 90%, 91 %, or at least 92%.
- a suitable assay for determining alkali-stability is the pH-stability assay of Example 4.
- the polypeptides of the invention and for use according to the invention have i) a relative activity at 15°C and pH 9 of at least 0.02, 0.04, 0.06, 0.08, 0.10, or at least 0.11; ii) a relative activity at 25°C and pH 9 of at least 0.05, 0.10, 0.15, or at least 0.17; and/or iii) a relative activity at 37 °C and pH 9 of at least 0.05, 0.10, 0.15, 0.20, 0.25, or at least 0.30.
- the temperature-profile test of Example 4 is used for these determinations.
- the polypeptides of the invention have a Tm, as determined by DSC, of at least 76.6°C, or of at least 77, 78, or at least 78.2°C. Tm is determined at pH 7.0 as described in Example 7.
- the protease of the invention exhibits a specific activity on haemoglobin at pH 7.5 and 25°C of at least 38.4 AU/g.
- the specific activity may be determined as described in Example 5.
- the protease of the invention may exhibit a specific activity of at least 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 49.8, or at least 50 AU/g.
- the model includes a gastric digestion step (1.0 hour at pH 3.0 and 40°C), and a subsequent intestinal digestion step (4.5 hours at pH 6.8 and 40°C).
- the model also includes addition of pepsin (3000 U/g, in the gastric digestion step), and of pancreatin (8 mg/g, in the intestinal digestion step).
- the protease dosage is 100 mg protease enzyme protein (EP) per kg of diet.
- a suitable model is described in Example 8.
- the level of improvement may be at least 14%, 15%, or at least 16%.
- the invention excludes the protease derived from (i) Nocardiopsis rougevillei NRRL 18133 which is disclosed in WO 88/03947 ; (ii) Nocardiopsis sp. strain OPC-210 (FERM P-10508) which is disclosed in JP 2-255081-A ; and/or (iii) the protease derived from strain ZIMET 43647 of the species Nocardiopsis josonvillei which is disclosed in DD 200432
- the present invention also relates to isolated nucleic acid sequences that encode a polypeptide of the present invention.
- Particular nucleic acid sequences of the invention are (i) nucleotides 1-1143, 1-87, 88-567, and 568-1143 of SEO ID NO: 1; (ii) nucleotides 1-1149, 1-87, 88-573, and 574-1149 of SEQ ID NO: 3; (iii) nucleotides 1-1149, 1-87, 88-573, and 574-1149 of SEQ ID NO: 5; (iv) nucleotides 1-1152, 1-87, 88-585, and 586-1152 of SEQ ID NO: 7; (v) nucleotides 1-1149, 1-87, 88-585, and 586-1149 of SEQ ID NO: 9; and (vi) nucleotides 1-1152, 1-87, 88-585, and 586-1152 of SEQ ID NO: 11; and (vii) any combination thereof.
- nucleotides are (i) nucleotides 568-1143 of SEQ ID NO: 1; (ii) nucleotides 574-1149 of SEQ ID NO: 3; (iii) nucleotides 574-1149 of SEQ ID NO: 5; (iv) nucleotides 586-1152 of SEQ ID NO: 7; (v) nucleotides 586-1149 of SEQ ID NO: 9; and (vi) nucleotides 586-1152 of SEQ ID NO: 11; corresponding to the mature polypeptide encoding parts or regions.
- the present invention also encompasses nucleic acid sequences which encode a polypeptide having the mature parts of either of SEQ ID NOs: 2, 4, 6, 8, 10 or 12, which differ from the corresponding parts of SEQ ID NOs: 1, 3, 5, 7, 9, and 11, respectively, by virtue of the degeneracy of the genetic code.
- the present invention also relates to subsequences of either of SEQ ID NOs: 1, 3, 5, 7, 9, and 11 which encode fragments of SEQ ID NOs: 2, 4, 6, 8, 10 or 12, respectively, and which have protease activity.
- a subsequence of either of SEQ ID NOs: 1, 3, 5, 7, 9, and 11 is a nucleic acid sequence encompassed by SEQ ID NOs: 1, 3, 5, 7, 9 or 11, except that one or more nucleotides from the 5' and/or 3' end have been deleted.
- a subsequence contains at least 100, 125, 150, 175, 200, or at least 225 nucleotides, more preferably at least 300 nucleotides, even more preferably at least 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, or at least 560 nucleotides.
- the present invention also relates to nucleotide sequences which have a degree of identity to the mature peptide encoding parts of either of SEQ ID NOs: 1, 3, 5, 7, 9, or 11 of at least 77.7%, preferably of at least 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or at least 99%.
- the present invention also relates to mutant nucleic acid sequences comprising at least one mutation in any of the nucleotides of (i)-(vi) listed above, preferably the mature peptide encoding parts thereof, in which the mutant nucleic acid sequence encodes a polypeptide which (i) consists of the amino acid sequences of either of SEQ ID NOs: 2, 4, 6, 8, 10, or 12, preferably the mature peptide parts thereof, or (ii) is a variant of any of the sequences of (i), wherein the variant comprises a substitution, deletion, and/or insertion of one or more amino acids, or (iii) is an allelic variant of any of the sequences of (i), or (iv) is a fragment of any of the sequences of (i).
- the techniques used to isolate or clone a nucleic acid sequence encoding a polypeptide include isolation from genomic DNA, preparation from cDNA, or a combination thereof.
- the cloning of the nucleic acid sequences of the present invention from such genomic DNA can be effected, e.g., by using the well known polymerase chain reaction (PCR) or antibody screening of expression libraries to detect cloned DNA fragments with shared structural features. See, e.g., Innis et al., 1990, PCR: A Guide to Methods and Application, Academic Press, New York .
- nucleic acid amplification procedures such as ligase chain reaction (LCR), ligated activated transcription (LAT) and nucleic acid sequence-based amplification (NASBA) may be used.
- LCR ligase chain reaction
- LAT ligated activated transcription
- NASBA nucleic acid sequence-based amplification
- the nucleic acid sequence may be cloned from a strain of Nocardiopsis, or another or related organism and thus, for example, may be an allelic or species variant of the polypeptide encoding region of the nucleic acid sequence.
- isolated nucleic acid sequence refers to a nucleic acid sequence which is essentially free of other nucleic acid sequences, e.g., at least about 20% pure, preferably at least about 40% pure, more preferably at least about 60% pure, even more preferably at least about 80% pure, and most preferably at least about 90% pure as determined by agarose electrophoresis.
- an isolated nucleic acid sequence can be obtained by standard cloning procedures used in genetic engineering to relocate the nucleic acid sequence from its natural location to a different site where it will be reproduced.
- the cloning procedures may involve excision and isolation of a desired nucleic acid fragment comprising the nucleic acid sequence encoding the polypeptide, insertion of the fragment into a vector molecule, and incorporation of the recombinant vector into a host cell where multiple copies or clones of the nucleic acid sequence will be replicated.
- the nucleic acid sequence may be of genomic, cDNA, RNA, semisynthetic, synthetic origin, or any combinations thereof.
- Modification of a nucleic acid sequence encoding a polypeptide of the present invention may be necessary for the synthesis of polypeptides substantially similar to the polypeptide.
- the term "substantially similar" to the polypeptide refers to non-naturally occurring forms of the polypeptide.
- These polypeptides may differ in some engineered way from the polypeptide isolated from its native source, e.g., variants that differ in specific activity, thermostability, pH optimum, allergenicity, or the like.
- the variant sequence may be constructed on the basis of the nucleic acid sequence presented as the polypeptide encoding part, or mature peptide encoding part, of either of SEQ ID NOs: 1, 3, 5, 7, 9 or 11, e.g., a subsequence thereof, and/or by introduction of nucleotide substitutions which do not give rise to another amino acid sequence of the polypeptide encoded by the nucleic acid sequence, but which correspond to the codon usage of the host organism intended for production of the protease, or by introduction of nucleotide substitutions which may give rise to a different amino acid sequence.
- nucleotide substitution see, e.g., Ford et al., 1991, Protein Expression and Purification 2: 95-107 .
- Low-allergenic polypeptides can e.g. be prepared as described above.
- amino acid residues essential to the activity of the polypeptide encoded by the isolated nucleic acid sequence of the invention may be identified according to procedures known in the art, such as site-directed mutagenesis or alanine-scanning mutagenesis (see, e.g., Cunningham and Wells, 1989, Science 244: 1081-1085 ). In the latter technique, mutations are introduced at every positively charged residue in the molecule, and the resultant mutant molecules are tested for protease activity to identify amino acid residues that are critical to the activity of the molecule.
- Sites of substrate-protease interaction can also be determined by analysis of the three-dimensional structure as determined by such techniques as nuclear magnetic resonance analysis, crystallography or photoaffinity labelling (see, e.g., de Vos et al., 1992, Science 255: 306-312 ; Smith et al., 1992, Journal of Molecular Biology 224: 899-904 ; Wlodaver et al., 1992, FEBS Letters 309: 59-64 ).
- the present invention also relates to isolated nucleic acid sequences encoding a polypeptide of the present invention, which hybridize under very low stringency conditions, preferably low stringency conditions, more preferably medium stringency conditions, more preferably medium-high stringency conditions, even more preferably high stringency conditions, and most preferably very high stringency conditions with a nucleic acid probe which hybridizes under the same conditions with the nucleic acid sequence of either of SEQ ID NOs: 1, 3, 5, 7, 9, or 11, preferably the mature peptide encoding parts thereof, or a complementary strand; or an allelic variant; or a subsequence thereof (Sambrook et al., 1989, supra), as defined herein.
- the present invention also relates to isolated nucleic acid sequences produced by (a) hybridizing a DNA under very low, low, medium, medium-high, high, or very high stringency conditions with any of the nucleotides mentioned under (i)-(vi) above, preferably the mature peptide encoding parts thereof, or a subsequence, or a complementary strand thereof; and (b) isolating the nucleic acid sequence.
- the present invention further relates to methods for producing a mutant nucleic acid sequence, comprising introducing at least one mutation into the mature polypeptide coding parts of either of SEQ ID NOs: 1, 3, 5, 7, 9, or 11, or a subsequence thereof, wherein the mutant nucleic acid sequence encodes a polypeptide which consists of the mature peptides of SEQ ID NOs: 2, 4, 6, 8, 10, and 12, respectively; or a fragment thereof which has protease activity.
- the introduction of a mutation into the nucleic acid sequence to exchange one nucleotide for another nucleotide may be accomplished by site-directed mutagenesis using any of the methods known in the art. Particularly useful is the procedure that utilizes a supercoiled, double stranded DNA vector with an insert of interest and two synthetic primers containing the desired mutation.
- the oligonucleotide primers each complementary to opposite strands of the vector, extend during temperature cycling by means of Pfu DNA polymerase. On incorporation of the primers, a mutated plasmid containing staggered nicks is generated. Following temperature cycling, the product is treated with Dpnl which is specific for methylated and hemimethylated DNA to digest the parental DNA template and to select for mutation-containing synthesized DNA. Other procedures known in the art may also be used.
- the present invention also relates to nucleic acid constructs comprising a nucleic acid sequence of the present invention operably linked to one or more control sequences that direct the expression of the coding sequence in a suitable host cell under conditions compatible with the control sequences.
- Expression will be understood to include any step involved in the production of the polypeptide including, but not limited to, transcription, post-transcriptional modification, translation, post-translational modification, and secretion.
- Nucleic acid construct is defined herein as a nucleic acid molecule, either single- or double-stranded, which is isolated from a naturally occurring gene or which has been modified to contain segments of nucleic acid combined and juxtaposed in a manner that would not otherwise exist in nature.
- nucleic acid construct is synonymous with the term expression cassette when the nucleic acid construct contains all the control sequences required for expression of a coding sequence of the present invention.
- coding sequence is defined herein as a nucleic acid sequence that directly specifies the amino acid sequence of its protein product.
- the boundaries of the coding sequence are generally determined by a ribosome binding site (prokaryotes) or by the ATG start codon (eukaryotes) located just upstream of the open reading frame at the 5' end of the mRNA and a transcription terminator sequence located just downstream of the open reading frame at the 3' end of the mRNA.
- a coding sequence can include, but is not limited to, DNA, cDNA, and recombinant nucleic acid sequences.
- An isolated nucleic acid sequence encoding a polypeptide of the present invention may be manipulated in a variety of ways to provide for expression of the polypeptide. Manipulation of the nucleic acid sequence prior to its insertion into a vector may be desirable or necessary depending on the expression vector. The techniques for modifying nucleic acid sequences utilizing recombinant DNA methods are well known in the art.
- control sequences is defined herein to include all components that are necessary or advantageous for the expression of a polypeptide of the present invention.
- Each control sequence may be native or foreign to the nucleic acid sequence encoding the polypeptide.
- control sequences include, but are not limited to, a leader, polyadenylation sequence, propeptide sequence, promoter, signal peptide sequence, and transcription terminator.
- the control sequences include a promoter, and transcriptional and translational stop signals.
- the control sequences may be provided with linkers for the purpose of introducing specific restriction sites facilitating ligation of the control sequences with the coding region of the nucleic acid sequence encoding a polypeptide.
- operably linked is defined herein as a configuration in which a control sequence is appropriately placed at a position relative to the coding sequence of the DNA sequence such that the control sequence directs the expression of a polypeptide.
- the control sequence may be an appropriate promoter sequence, a nucleic acid sequence that is recognized by a host cell for expression of the nucleic acid sequence.
- the promoter sequence contains transcriptional control sequences that mediate the expression of the polypeptide.
- the promoter may be any nucleic acid sequence which shows transcriptional activity in the host cell of choice including mutant, truncated, and hybrid promoters, and may be obtained from genes encoding extracellular or intracellular polypeptides either homologous or heterologous to the host cell.
- suitable promoters for directing the transcription of the nucleic acid constructs of the present invention are the promoters obtained from the E. coli lac operon, Streptomyces coelicolor agarase gene (dagA), Bacillus subtilis levansucrase gene (sacB), Bacillus licheniformis alpha-amylase gene (amyL), Bacillus stearothermophilus maltogenic amylase gene (amyM), Bacillus amyloliquefaciens alpha-amylase gene (amyQ), Bacillus licheniformis penicillinase gene (penP), Bacillus subtilis xylA and xylB genes, and prokaryotic beta-lactamase gene ( Villa-Kamaroff et al., 1978, Proceedings of the National Academy of Sciences USA 75: 3727-3731 ), as well as the tac promoter ( DeBoer et al., 1983, Proceedings
- promoters for directing the transcription of the nucleic acid constructs of the present invention in a filamentous fungal host cell are promoters obtained from the genes for Aspergillus oryzae TAKA amylase, Rhizomucor miehei aspartic proteinase, Aspergillus niger neutral alpha-amylase, Aspergillus niger acid stable alpha-amylase, Aspergillus niger or Aspergillus awamori glucoamylase (glaA), Rhizomucor miehei lipase, Aspergillus oryzae alkaline protease, Aspergillus oryzae triose phosphate isomerase, Aspergillus nidulans acetamidase, and Fusarium oxysporum trypsin-like protease ( WO 96/00787 ), as well as the NA2-tpi promoter (a hybrid of the promoters from the genes for As
- useful promoters are obtained from the genes for Saccharomyces cerevisiae enolase (ENO-1), Saccharomyces cerevisiae galactokinase (GAL1), Saccharomyces cerevisiae alcohol dehydrogenase/glyceraldehyde-3-phosphate dehydrogenase (ADH2/GAP), and Saccharomyces cerevisiae 3-phosphoglycerate kinase.
- ENO-1 Saccharomyces cerevisiae enolase
- GAL1 Saccharomyces cerevisiae galactokinase
- ADH2/GAP Saccharomyces cerevisiae alcohol dehydrogenase/glyceraldehyde-3-phosphate dehydrogenase
- Saccharomyces cerevisiae 3-phosphoglycerate kinase Other useful promoters for yeast host cells are described by Romanos et al., 1992, Yeast 8: 423
- the control sequence may also be a suitable transcription terminator sequence, a sequence recognized by a host cell to terminate transcription.
- the terminator sequence is operably linked to the 3' terminus of the nucleic acid sequence encoding the polypeptide. Any terminator which is functional in the host cell of choice may be used in the present invention.
- Preferred terminators for filamentous fungal host cells are obtained from the genes for Aspergillus oryzae TAKA amylase, Aspergillus niger glucoamylase, Aspergillus nidulans anthranilate synthase, Aspergillus niger alpha-glucosidase, and Fusarium oxysporum trypsin-like protease.
- Preferred terminators for yeast host cells are obtained from the genes for Saccharomyces cerevisiae enolase, Saccharomyces cerevisiae cytochrome C (CYC1), and Saccharomyces cerevisiae glyceraldehyde-3-phosphate dehydrogenase.
- Other useful terminators for yeast host cells are described by Romanos et al., 1992, supra.
- Preferred terminators for bacterial host cells are the terminators from Bacillus licheniformis alpha-amylase gene (amyL), the Bacillus stearothermophilus maltogenic amylase gene (amyM), or the Bacillus amyloliquefaciens alpha-amylase gene (amyQ).
- the control sequence may also be a suitable leader sequence, a nontranslated region of an mRNA which is important for translation by the host cell.
- the leader sequence is operably linked to the 5' terminus of the nucleic acid sequence encoding the polypeptide. Any leader sequence that is functional in the host cell of choice may be used in the present invention.
- Preferred leaders for filamentous fungal host cells are obtained from the genes for Aspergillus oryzae TAKA amylase and Aspergillus nidulans triose phosphate isomerase.
- Suitable leaders for yeast host cells are obtained from the genes for Saccharomyces cerevisiae enolase (ENO-1), Saccharomyces cerevisiae 3-phosphoglycerate kinase, Saccharomyces cerevisiae alpha-factor, and Saccharomyces cerevisiae alcohol dehydrogenase/glyceraldehyde-3-phosphate dehydrogenase (ADH2/GAP).
- ENO-1 Saccharomyces cerevisiae enolase
- Saccharomyces cerevisiae 3-phosphoglycerate kinase Saccharomyces cerevisiae alpha-factor
- Saccharomyces cerevisiae alcohol dehydrogenase/glyceraldehyde-3-phosphate dehydrogenase ADH2/GAP
- the control sequence may also be a polyadenylation sequence, a sequence operably linked to the 3' terminus of the nucleic acid sequence and which, when transcribed, is recognized by the host cell as a signal to add polyadenosine residues to transcribed mRNA. Any polyadenylation sequence which is functional in the host cell of choice may be used in the present invention.
- Preferred polyadenylation sequences for filamentous fungal host cells are obtained from the genes for Aspergillus oryzae TAKA amylase, Aspergillus niger glucoamylase, Aspergillus nidulans anthranilate synthase, Fusarium oxysporum trypsin-like protease, and Aspergillus niger alpha-glucosidase.
- yeast host cells Useful polyadenylation sequences for yeast host cells are described by Guo and Sherman, 1995, Molecular Cellular Biology 15: 5983-5990 .
- the control sequence may also be a signal peptide coding region that codes for an amino acid sequence linked to the amino terminus of a polypeptide and directs the encoded polypeptide into the cell's secretory pathway.
- the 5' end of the coding sequence of the nucleic acid sequence may inherently contain a signal peptide coding region naturally linked in translation reading frame with the segment of the coding region which encodes the secreted polypeptide.
- the 5' end of the coding sequence may contain a signal peptide coding region which is foreign to the coding sequence.
- the foreign signal peptide coding region may be required where the coding sequence does not naturally contain a signal peptide coding region.
- the foreign signal peptide coding region may simply replace the natural signal peptide coding region in order to enhance secretion of the polypeptide.
- any signal peptide coding region which directs the expressed polypeptide into the secretory pathway of a host cell of choice may be used in the present invention.
- Effective signal peptide coding regions for bacterial host cells are the signal peptide coding regions obtained from the genes for Bacillus NCIB 11837 maltogenic amylase, Bacillus stearothermophilus alpha-amylase, Bacillus licheniformis subtilisin, Bacillus licheniformis alpha-amylase, Bacillus stearothermophilus neutral proteases (nprT, nprS, nprM), and Bacillus subtilis prsA. Further signal peptides are described by Simonen and Palva, 1993, Microbiological Reviews 57: 109-137 .
- Effective signal peptide coding regions for filamentous fungal host cells are the signal peptide coding regions obtained from the genes for Aspergillus oryzae TAKA amylase, Aspergillus niger neutral amylase, Aspergillus niger glucoamylase, Rhizomucor miehei aspartic proteinase, Humicola insolens cellulase, and Humicola lanuginosa lipase.
- Useful signal peptides for yeast host cells are obtained from the genes for Saccharomyces cerevisiae alpha-factor and Saccharomyces cerevisiae invertase. Other useful signal peptide coding regions are described by Romanos et al., 1992, supra.
- the control sequence may also be a propeptide coding region that codes for an amino acid sequence positioned at the amino terminus of a polypeptide.
- the resultant polypeptide is known as a proenzyme or propolypeptide (or a zymogen in some cases).
- a propolypeptide is generally inactive and can be converted to a mature active polypeptide by catalytic or autocatalytic cleavage of the propeptide from the propolypeptide.
- the propeptide coding region may be obtained from the genes for Bacillus subtilis alkaline protease (aprE), Bacillus subtilis neutral protease (nprT), Saccharomyces cerevisiae alpha-factor, Rhizomucor miehei aspartic proteinase, and Myceliophthora thermophila laccase ( WO 95/33836 ).
- the signal peptide coding region is the signal peptide coding region of either of SEQ ID NOs: 1, 3, 5, 7, 9, or 11.
- the propeptide coding region is the propeptide coding regions of either of SEQ ID NOs: 1, 3, 5, 7, 9, or 11.
- the propeptide region is positioned next to the amino terminus of a polypeptide and the signal peptide region is positioned next to the amino terminus of the propeptide region.
- regulatory sequences which allow the regulation of the expression of the polypeptide relative to the growth of the host cell.
- regulatory systems are those which cause the expression of the gene to be turned on or off in response to a chemical or physical stimulus, including the presence of a regulatory compound.
- Regulatory systems in prokaryotic systems include the lac, tac, and trp operator systems.
- yeast the ADH2 system or GAL1 system may be used.
- filamentous fungi the TAKA alpha-amylase promoter, Aspergillus niger glucoamylase promoter, and Aspergillus oryzae glucoamylase promoter may be used as regulatory sequences.
- Other examples of regulatory sequences are those which allow for gene amplification.
- these include the dihydrofolate reductase gene which is amplified in the presence of methotrexate, and the metallothionein genes which are amplified with heavy metals.
- the nucleic acid sequence encoding the polypeptide would be operably linked with the regulatory sequence.
- the present invention also relates to recombinant expression vectors comprising a nucleic acid sequence of the present invention, a promoter, and transcriptional and translational stop signals.
- the various nucleic acid and control sequences described above may be joined together to produce a recombinant expression vector which may include one or more convenient restriction sites to allow for insertion or substitution of the nucleic acid sequence encoding the polypeptide at such sites.
- the nucleic acid sequence of the present invention may be expressed by inserting the nucleic acid sequence or a nucleic acid construct comprising the sequence into an appropriate vector for expression.
- the coding sequence is located in the vector so that the coding sequence is operably linked with the appropriate control sequences for expression.
- the recombinant expression vector may be any vector (e.g., a plasmid or virus) which can be conveniently subjected to recombinant DNA procedures and can bring about the expression of the nucleic acid sequence.
- the choice of the vector will typically depend on the compatibility of the vector with the host cell into which the vector is to be introduced.
- the vectors may be linear or closed circular plasmids.
- the vector may be an autonomously replicating vector, i.e., a vector which exists as an extrachromosomal entity, the replication of which is independent of chromosomal replication, e.g., a plasmid, an extrachromosomal element, a minichromosome, or an artificial chromosome.
- the vector may contain any means for assuring self-replication.
- the vector may be one which, when introduced into the host cell, is integrated into the genome and replicated together with the chromosome(s) into which it has been integrated.
- a single vector or plasmid or two or more vectors or plasmids which together contain the total DNA to be introduced into the genome of the host cell, or a transposon may be used.
- the vectors of the present invention preferably contain one or more selectable markers which permit easy selection of transformed cells.
- a selectable marker is a gene the product of which provides for biocide or viral resistance, resistance to heavy metals, prototrophy to auxotrophs, and the like.
- Examples of bacterial selectable markers are the dal genes from Bacillus subtilis or Bacillus licheniformis, or markers which confer antibiotic resistance such as ampicillin, kanamycin, chloramphenicol or tetracycline resistance.
- Suitable markers for yeast host cells are ADE2, HIS3, LEU2, LYS2, MET3, TRP1, and URA3.
- Selectable markers for use in a filamentous fungal host cell include, but are not limited to, amdS (acetamidase), argB (ornithine carbamoyltransferase), bar (phosphinothricin acetyltransferase), hygB (hygromycin phosphotransferase), niaD (nitrate reductase), pyrG (orotidine-5'-phosphate decarboxylase), sC (sulfate adenyltransferase), trpC (anthranilate synthase), as well as equivalents thereof.
- Preferred for use in an Aspergillus cell are the amdS and pyrG genes of Aspergillus nidulans or Aspergillus oryzae and the bar gene of Streptomyces hygroscopicus.
- the vectors of the present invention preferably contain an element(s) that permits stable integration of the vector into the host cell's genome or autonomous replication of the vector in the cell independent of the genome.
- the vector may rely on the nucleic acid sequence encoding the polypeptide or any other element of the vector for stable integration of the vector into the genome by homologous or non homologous recombination.
- the vector may contain additional nucleic acid sequences for directing integration by homologous recombination into the genome of the host cell. The additional nucleic acid sequences enable the vector to be integrated into the host cell genome at a precise location(s) in the chromosome(s).
- the integrational elements should preferably contain a sufficient number of nucleic acids, such as 100 to 1,500 base pairs, preferably 400 to 1,500 base pairs, and most preferably 800 to 1,500 base pairs, which are highly homologous with the corresponding target sequence to enhance the probability of homologous recombination.
- the integrational elements may be any sequence that is homologous with the target sequence in the genome of the host cell.
- the integrational elements may be non-encoding or encoding nucleic acid sequences.
- the vector may be integrated into the genome of the host cell by non-homologous recombination.
- the vector may further comprise an origin of replication enabling the vector to replicate autonomously in the host cell in question.
- origins of replication are the origins of replication of plasmids pBR322, pUC19, pACYC177, and pACYC184 permitting replication in E . coli, and pUB110, pE194, pTA1060, and pAM ⁇ 1 permitting replication in Bacillus.
- origins of replication for use in a yeast host cell are the 2 micron origin of replication, ARS1, ARS4, the combination of ARS1 and CEN3, and the combination of ARS4 and CEN6.
- the origin of replication may be one having a mutation which makes its functioning temperature-sensitive in the host cell (see, e.g., Ehrlich, 1978, Proceedings of the National Academy of Sciences USA 75: 1433 ).
- More than one copy of a nucleic acid sequence of the present invention may be inserted into the host cell to increase production of the gene product.
- An increase in the copy number of the nucleic acid sequence can be obtained by integrating at least one additional copy of the sequence into the host cell genome or by including an amplifiable selectable marker gene with the nucleic acid sequence where cells containing amplified copies of the selectable marker gene, and thereby additional copies of the nucleic acid sequence, can be selected for by cultivating the cells in the presence of the appropriate selectable agent.
- the protease may also be co-expressed together with at least one other enzyme of interest for animal feed, such as an amylase; phytase; xylanase; galactanase; alpha-galactosidase; protease, phospholipase; and/or a beta-glucanase.
- an amylase such as an amylase; phytase; xylanase; galactanase; alpha-galactosidase; protease, phospholipase; and/or a beta-glucanase.
- the enzymes may be co-expressed from different vectors, from one vector, or using a mixture of both techniques.
- the vectors may have different selectable markers, and different origins of replication.
- the genes can be expressed from one or more promoters. If cloned under the regulation of one promoter (di- or multi-cistronic), the order in which the genes are cloned may affect the expression levels of the proteins.
- the protease may also be expressed as a fusion protein, i.e. that the gene encoding protease has been fused in frame to the gene encoding another protein. This protein may be another enzyme or a functional domain from another enzyme.
- the present invention also relates to recombinant host cells, comprising a nucleic acid sequence of the invention, which are advantageously used in the recombinant production of the polypeptides.
- a vector comprising a nucleic acid sequence of the present invention is introduced into a host cell so that the vector is maintained as a chromosomal integrant or as a self-replicating extra-chromosomal vector as described earlier.
- the term "host cell” encompasses any progeny of a parent cell that is not identical to the parent cell due to mutations that occur during replication. The choice of a host cell will to a large extent depend upon the gene encoding the polypeptide and its source.
- the host cell may be a unicellular microorganism, e.g., a prokaryote, or a non-unicellular microorganism, e.g., a eukaryote.
- Useful unicellular cells are bacterial cells such as gram positive bacteria including, but not limited to, a Bacillus cell, or a Streptomyces cell, or cells of lactic acid bacteria; or gram negative bacteria such as E. coli and Pseudomonas sp.
- Lactic acid bacteria include, but are not limited to, species of the genera Lactococcus, Lactobacillus, Leuconostoc, Streptococcus, Pediococcus, and Enterococcus.
- the introduction of a vector into a bacterial host cell may, for instance, be effected by protoplast transformation (see, e.g., Chang and Cohen, 1979, Molecular General Genetics 168: 111-115 ), using competent cells (see, e.g., Young and Spizizin, 1961, Journal of Bacteriology 81: 823-829 , or Dubnau and Davidoff-Abelson, 1971, Journal of Molecular Biology 56: 209-221 ), electroporation (see, e.g., Shigekawa and Dower, 1988, Biotechniques 6: 742-751 ), or conjugation (see, e.g., Koehler and Thorne, 1987, Journal of Bacteriology 169: 5771-5278 ).
- the host cell may be a eukaryote, such as a non-human animal cell, an insect cell, a plant cell, or a fungal cell.
- the host cell is a fungal cell.
- "Fungi” as used herein includes the phyla Ascomycota, Basidiomycota, Chytridiomycota, and Zygomycota (as defined by Hawksworth et al., In, Ainsworth and Bisby's Dictionary of The Fungi, 8th edition, 1995, CAB International, University Press, Cambridge, UK ) as well as the Oomycota (as cited in Hawksworth et al., 1995, supra, page 171) and all mitosporic fungi (Hawksworth et al., 1995, supra).
- the fungal host cell is a yeast cell.
- yeast as used herein includes ascosporogenous yeast (Endomycetales), basidiosporogenous yeast, and yeast belonging to the Fungi Imperfecti (Blastomycetes). Since the classification of yeast may change in the future, for the purposes of this invention, yeast shall be defined as described in Biology and Activities of Yeast (Skinner, F.A., Passmore, S.M., and Davenport, R.R., eds, Soc. App. Bacteriol. Symposium Series No. 9, 1980 ).
- the yeast host cell may be a Candida, Hansenula, Kluyveromyces, Pichia, Saccharomyces, Schizosaccharomyces, or Yarrowia cell.
- the fungal host cell may be a filamentous fungal cell.
- "Filamentous fungi” include all filamentous forms of the subdivision Eumycota and Oomycota (as defined by Hawksworth et al., 1995, supra).
- the filamentous fungi are characterized by a mycelial wall composed of chitin, cellulose, glucan, chitosan, mannan, and other complex polysaccharides.
- Vegetative growth is by hyphal elongation and carbon catabolism is obligately aerobic.
- vegetative growth by yeasts such as Saccharomyces cerevisiae is by budding of a unicellular thallus and carbon catabolism may be fermentative.
- filamentous fungal host cells are cells of species of, but not limited to, Acremonium, Aspergillus, Fusarium, Humicola, Mucor, Myceliophthora, Neurospora, Penicillium, Thielavia, Tolypocladium, or Trichoderma.
- Fungal cells may be transformed by a process involving protoplast formation, transformation of the protoplasts, and regeneration of the cell wall in a manner known per se. Suitable procedures for transformation of Aspergillus host cells are described in EP 238 023 and Yelton et al., 1984, Proceedings of the National Academy of Sciences USA 81: 1470-1474 . Suitable methods for transforming Fusarium species are described by Malardier et al., 1989, Gene 78: 147-156 and WO 96/00787 . Yeast may be transformed using the procedures described by Becker and Guarente, In Abelson, J.N.
- the present invention also relates to methods for producing a polypeptide of the present invention comprising (a) cultivating a strain, which in its wild-type form is capable of producing the polypeptide, to produce a supernatant comprising the polypeptide; and (b) recovering the polypeptide.
- the strain is of the phylum Actinobacteria, preferably of the class Actinobacteria, more preferably of the order Actinomycetales, even more preferably of the family Nocardiopsaceae, and most preferably of the genus Nocardiopsis, for example any of the Nocardiopsis species, such as the specific strains listed hereinbefore.
- the present invention also relates to methods for producing a polypeptide of the present invention comprising (a) cultivating a host cell under conditions conducive for production of the polypeptide; and (b) recovering the polypeptide.
- the present invention also relates to methods for producing a polypeptide of the present invention comprising (a) cultivating a host cell under conditions conducive for production of the polypeptide, wherein the host cell comprises a mutant nucleic acid sequence comprising at least one mutation in the mature peptide encoding parts of either of SEQ ID NOs: 1, 3, 5, 7, 9, or 11, in which the mutant nucleic acid sequence encodes a polypeptide which (i) consists of the mature peptides of either of SEQ ID NOs: 2, 4, 6, 8, 10, or 12, respectively; or (ii) is a variant of any of the sequences of (i), wherein the variant comprises a substitution, deletion, and/or insertion of one or more amino acids, or (iii) is an allelic variant of any of the sequences of (i), or (iv) is a fragment of any of the sequences of (i).
- the cells are cultivated in a nutrient medium suitable for production of the polypeptide using methods known in the art.
- the cell may be cultivated by shake flask cultivation, small-scale or large-scale fermentation (including continuous, batch, fed-batch, or solid state fermentations) in laboratory or industrial fermentors performed in a suitable medium and under conditions allowing the polypeptide to be expressed and/or isolated.
- the cultivation takes place in a suitable nutrient medium comprising carbon and nitrogen sources and inorganic salts, using procedures known in the art. Suitable media are available from commercial suppliers or may be prepared according to published compositions (e.g., in catalogues of the American Type Culture Collection). If the polypeptide is secreted into the nutrient medium, the polypeptide can be recovered directly from the medium. If the polypeptide is not secreted, it can be recovered from cell lysates.
- the polypeptides may be detected using methods known in the art that are specific for the polypeptides. These detection methods may include use of specific antibodies, formation of a protease product, or disappearance of a protease substrate. For example, a protease assay may be used to determine the activity of the polypeptide as described herein.
- the resulting polypeptide may be recovered by methods known in the art.
- the polypeptide may be recovered from the nutrient medium by conventional procedures including, but not limited to, centrifugation, filtration, extraction, spray-drying, evaporation, or precipitation.
- polypeptides of the present invention may be purified by a variety of procedures known in the art including, but not limited to, chromatography (e.g., ion exchange, affinity, hydrophobic, chromatofocusing, and size exclusion), electrophoretic procedures (e.g., preparative isoelectric focusing), differential solubility (e.g., ammonium sulfate precipitation), SDS-PAGE, or extraction (see, e.g., Protein Purification, J.-C. Janson and Lars Ryden, editors, VCH Publishers, New York, 1989 ).
- chromatography e.g., ion exchange, affinity, hydrophobic, chromatofocusing, and size exclusion
- electrophoretic procedures e.g., preparative isoelectric focusing
- differential solubility e.g., ammonium sulfate precipitation
- SDS-PAGE or extraction
- the present invention also relates to a transgenic plant, plant part, or plant cell which has been transformed with a nucleic acid sequence encoding a polypeptide having protease activity of the present invention so as to express and produce the polypeptide in recoverable quantities.
- the polypeptide may be recovered from the plant or plant part.
- the plant or plant part containing the recombinant polypeptide may be used as such for improving the quality of a food or feed, e.g., improving nutritional value, palatability, and rheological properties, or to destroy an antinutritive factor.
- the polypeptide is targeted to the endosperm storage vacuoles in seeds.
- This can be obtained by synthesizing it as a precursor with a suitable signal peptide, see Horvath et al in PNAS, Feb. 15, 2000, vol. 97, no. 4, p. 1914-1919 .
- the transgenic plant can be dicotyledonous (a dicot) or monocotyledonous (a monocot) or engineered variants thereof.
- monocot plants are grasses, such as meadow grass (blue grass, Poa), forage grass such as Festuca, Lolium, temperate grass, such as Agrostis, and cereals, e.g., wheat, oats, rye, barley, rice, sorghum, triticale (stabilized hybrid of wheat ( Triticum ) and rye ( Secale ), and maize (corn).
- dicot plants are tobacco, legumes, such as sunflower ( Helianthus ), cotton ( Gossypium ), lupins, potato, sugar beet, pea, bean and soybean, and cruciferous plants (family Brassicaceae), such as cauliflower, rape seed, and the closely related model organism Arabidopsis thaliana.
- Low-phytate plants as described e.g. in US patent no. 5,689,054 and US patent no. 6,111,168 are examples of engineered plants.
- plant parts are stem, callus, leaves, root, fruits, seeds, and tubers, as well as the individual tissues comprising these parts, e.g. epidermis, mesophyll, parenchyma, vascular tissues, meristems. Also specific plant cell compartments, such as chloroplast, apoplast, mitochondria, vacuole, peroxisomes, and cytoplasm are considered to be a plant part. Furthermore, any plant cell, whatever the tissue origin, is considered to be a plant part. Likewise, plant parts such as specific tissues and cells isolated to facilitate the utilisation of the invention are also considered plant parts, e.g. embryos, endosperms, aleurone and seed coats.
- the transgenic plant or plant cell expressing a polypeptide of the present invention may be constructed in accordance with methods known in the art. Briefly, the plant or plant cell is constructed by incorporating one or more expression constructs encoding a polypeptide of the present invention into the plant host genome and propagating the resulting modified plant or plant cell into a transgenic plant or plant cell.
- the expression construct is a nucleic acid construct which comprises a nucleic acid sequence encoding a polypeptide of the present invention operably linked with appropriate regulatory sequences required for expression of the nucleic acid sequence in the plant or plant part of choice.
- the expression construct may comprise a selectable marker useful for identifying host cells into which the expression construct has been integrated and DNA sequences necessary for introduction of the construct into the plant in question (the latter depends on the DNA introduction method to be used).
- regulatory sequences such as promoter and terminator sequences and optionally signal or transit sequences are determined, for example, on the basis of when, where, and how the polypeptide is desired to be expressed.
- the expression of the gene encoding a polypeptide of the present invention may be constitutive or inducible, or may be developmental, stage or tissue specific, and the gene product may be targeted to a specific cell compartment, tissue or plant part such as seeds or leaves.
- Regulatory sequences are, for example, described by Tague et al., 1988, Plant Physiology 86: 506 .
- the following promoters may be used: The 35S-CaMV promoter ( Franck et al., 1980, Cell 21: 285-294 ), the maize ubiquitin 1 (Christensen AH, Sharrock RA and Quail 1992. Maize polyubiquitin genes: structure, thermal perturbation of expression and transcript splicing, and promoter activity following transfer to protoplasts by electroporation), or the rice actin 1 promoter ( Plant Mo. Biol. 18, 675-689 .; Zhang W, McElroy D. and Wu R 1991, Analysis of rice Act1 5' region activity in transgenic rice plants. Plant Cell 3, 1155-1165 ).
- Organ-specific promoters may be, for example, a promoter from storage sink tissues such as seeds, potato tubers, and fruits ( Edwards & Coruzzi, 1990, Ann. Rev. Genet. 24: 275-303 ), or from metabolic sink tissues such as meristems ( Ito et al., 1994, Plant Mol. Biol.
- a seed specific promoter such as the glutelin, prolamin, globulin, or albumin promoter from rice ( Wu et al., 1998, Plant and Cell Physiology 39: 885-889 ), a Vicia faba promoter from the legumin B4 and the unknown seed protein gene from Vicia faba ( Conrad et al., 1998, Journal of Plant Physiology 152: 708-711 ), a promoter from a seed oil body protein ( Chen et al., 1998, Plant and Cell Physiology 39: 935-941 ), the storage protein napA promoter from Brassica napus, or any other seed specific promoter known in the art, e.g., as described in WO 91/14772 .
- the promoter may be a leaf specific promoter such as the rbcs promoter from rice or tomato ( Kyozuka et al., 1993, Plant Physiology 102: 991-1000 , the chlorella virus adenine methyltransferase gene promoter ( Mitra and Higgins, 1994, Plant Molecular Biology 26: 85-93 ), or the aldP gene promoter from rice ( Kagaya et al., 1995, Molecular and General Genetics 248: 668-674 ), or a wound inducible promoter such as the potato pin2 promoter ( Xu et al., 1993, Plant Molecular Biology 22: 573-588 ).
- rbcs promoter from rice or tomato
- the chlorella virus adenine methyltransferase gene promoter Mitra and Higgins, 1994, Plant Molecular Biology 26: 85-93
- aldP gene promoter from rice
- the promoter may be inducible by abiotic treatments such as temperature, drought or alterations in salinity or inducible by exogenously applied substances that activate the promoter, e.g. ethanol, oestrogens, plant hormones like ethylene, abscisic acid, gibberellic acid, and/or heavy metals.
- abiotic treatments such as temperature, drought or alterations in salinity or inducible by exogenously applied substances that activate the promoter, e.g. ethanol, oestrogens, plant hormones like ethylene, abscisic acid, gibberellic acid, and/or heavy metals.
- a promoter enhancer element may also be used to achieve higher expression of the protease in the plant.
- the promoter enhancer element may be an intron which is placed between the promoter and the nucleotide sequence encoding a polypeptide of the present invention.
- Xu et al., 1993, supra disclose the use of the first intron of the rice actin 1 gene to enhance expression.
- codon usage may be optimized for the plant species in question to improve expression (see Horvath et al referred to above).
- the selectable marker gene and any other parts of the expression construct may be chosen from those available in the art.
- the nucleic acid construct is incorporated into the plant genome according to conventional techniques known in the art, including Agrobacterium-mediated transformation, virus-mediated transformation, microinjection, particle bombardment, biolistic transformation, and electroporation ( Gasser et al., 1990, Science 244: 1293 ; Potrykus, 1990, Bio/Technology 8: 535 ; Shimamoto et al., 1989, Nature 338: 274 ).
- Agrobacterium tumefaciens -mediated gene transfer is the method of choice for generating transgenic dicots (for a review, see Hooykas and Schilperoort, 1992, Plant Molecular Biology 19: 15-38 ), and it can also be used for transforming monocots, although other transformation methods are more often used for these plants.
- the method of choice for generating transgenic monocots, supplementing the Agrobacterium approach is particle bombardment (microscopic gold or tungsten particles coated with the transforming DNA) of embryonic calli or developing embryos ( Christou, 1992, Plant Journal 2: 275-281 ; Shimamoto, 1994, Current Opinion Biotechnology 5: 158-162 ; Vasil et al., 1992, Bio/Technology 10: 667-674 ).
- An alternative method for transformation of monocots is based on protoplast transformation as described by Omirulleh et al., 1993, Plant Molecular Biology 21: 415-428 .
- the transformants having incorporated therein the expression construct are selected and regenerated into whole plants according to methods well-known in the art.
- the transformation procedure is designed for the selective elimination of selection genes either during regeneration or in the following generations by using e.g. co-transformation with two separate T-DNA constructs or site specific excision of the selection gene by a specific recombinase.
- the present invention also relates to methods for producing a polypeptide of the present invention comprising (a) cultivating a transgenic plant or a plant cell comprising a nucleic acid sequence encoding a polypeptide having protease activity of the present invention under conditions conducive for production of the polypeptide; and (b) recovering the polypeptide.
- the present invention also relates to a transgenic, non-human animal and products or elements thereof, examples of which are body fluids such as milk and blood, organs, flesh, and animal cells.
- body fluids such as milk and blood, organs, flesh, and animal cells.
- Techniques for expressing proteins, e.g. in mammalian cells are known in the art, see e.g. the handbook Protein Expression: A Practical Approach, Higgins and Hames (eds), Oxford University Press (1999 ), and the three other handbooks in this series relating to Gene Transcription, RNA processing, and Post-translational Processing.
- to prepare a transgenic animal selected cells of a selected animal are transformed with a nucleic acid sequence encoding a polypeptide having protease activity of the present invention so as to express and produce the polypeptide.
- the polypeptide may be recovered from the animal, e.g. from the milk of female animals, or the polypeptide may be expressed to the benefit of the animal itself, e.g. to assist the animal's digestion. Examples of animals are mentioned below in the section headed Animal Feed.
- a gene encoding the protease may be inserted into the fertilized eggs of an animal in question, e.g. by use of a transgene expression vector which comprises a suitable milk protein promoter, and the gene encoding protease.
- the transgene expression vector is microinjected into fertilized eggs, and preferably permanently integrated into the chromosome. Once the egg begins to grow and divide, the potential embryo is implanted into a surrogate mother, and animals carrying the transgene are identified. The resulting animal can then be multiplied by conventional breeding.
- the polypeptide may be purified from the animal's milk, see e.g. Meade, H.M. et al (1999): Expression of recombinant proteins in the milk of transgenic animals, Gene expression systems: Using nature for the art of expression. J. M. Fernandez and J. P. Hoeffler (eds.), Academic Press .
- the transgene in order to produce a transgenic non-human animal that carries in the genome of its somatic and/or germ cells a nucleic acid sequence including a heterologous transgene construct including a transgene encoding protease, the transgene may be operably linked to a first regulatory sequence for salivary gland specific expression of protease, as disclosed in WO 2000064247 .
- the present invention relates to compositions comprising a polypeptide of the present invention.
- polypeptide compositions may be prepared in accordance with methods known in the art and may be in the form of a liquid or a dry composition.
- the polypeptide composition may be in the form of a granulate or a microgranulate.
- the polypeptide to be included in the composition may be stabilized in accordance with methods known in the art.
- the present invention is also directed to methods for using the polypeptides having protease activity in animal feed, as well as to feed compositions and feed additives comprising the polypeptides of the invention.
- animal includes all animals, including human beings. Examples of animals are non-ruminants, and ruminants. Ruminant animals include, for example, animals such as sheep, goats, horses, and cattle, e.g. beef cattle, cows, and young calves. In a particular embodiment, the animal is a non-ruminant animal. Non-ruminant animals include monogastric animals, e.g.
- pigs or swine including, but not limited to, piglets, growing pigs, and sows
- poultry such as turkeys, ducks and chicken (including but not limited to broiler chicks, layers); young calves; and fish (including but not limited to salmon, trout, tilapia, catfish and carps; and crustaceans (including but not limited to shrimps and prawns).
- feed or feed composition means any compound, preparation, mixture, or composition suitable for, or intended for intake by an animal.
- the protease can be fed to the animal before, after, or simultaneously with the diet.
- the latter is preferred.
- the protease in the form in which it is added to the feed, or when being included in a feed additive, is well-defined.
- Well-defined means that the protease preparation is at least 50% pure as determined by Size-exclusion chromatography (see Example 12 of WO 01/58275 ).
- the protease preparation is at least 60, 70, 80, 85, 88, 90, 92, 94, or at least 95% pure as determined by this method.
- a well-defined protease preparation is advantageous. For instance, it is much easier to dose correctly to the feed a protease that is essentially free from interfering or contaminating other proteases.
- dose correctly refers in particular to the objective of obtaining consistent and constant results, and the capability of optimising dosage based upon the desired effect.
- the protease need not be that pure; it may e.g. include other enzymes, in which case it could be termed a protease preparation.
- the protease preparation can be (a) added directly to the feed (or used directly in a protein treatment process), or (b) it can be used in the production of one or more intermediate compositions such as feed additives or premixes that is subsequently added to the feed (or used in a treatment process).
- the degree of purity described above refers to the purity of the original protease preparation, whether used according to (a) or (b) above.
- Protease preparations with purities of this order of magnitude are in particular obtainable using recombinant methods of production, whereas they are not so easily obtained and also subject to a much higher batch-to-batch variation when the protease is produced by traditional fermentation methods.
- Such protease preparation may of course be mixed with other enzymes.
- the protease for use according to the invention is capable of solubilising proteins according to the in vitro model of Example 8 herein.
- the protein may be an animal protein, such as meat and bone meal, and/or fish meal; or it may be a vegetable protein.
- vegetable proteins refers to any compound, composition, preparation or mixture that includes at least one protein derived from or originating from a vegetable, including modified proteins and protein-derivatives.
- the protein content of the vegetable proteins is at least 10, 20, 30, 40, 50, or 60% (w/w).
- Vegetable proteins may be derived from vegetable protein sources, such as legumes and cereals, for example materials from plants of the families Fabaceae ( Leguminosae ), Cruciferaceae, Chenopodiaceae, and Poaceae, such as soy bean meal, lupin meal and rapeseed meal.
- Fabaceae Leguminosae
- Cruciferaceae Cruciferaceae
- Chenopodiaceae Chenopodiaceae
- Poaceae such as soy bean meal, lupin meal and rapeseed meal.
- the vegetable protein source is material from one or more plants of the family Fabaceae, e.g. soybean, lupine, pea, or bean.
- the vegetable protein source is material from one or more plants of the family Chenopodiaceae, e.g. beet, sugar beet, spinach or quinoa.
- vegetable protein sources are rapeseed, sunflower seed, cotton seed, and cabbage.
- Soybean is a preferred vegetable protein source.
- vegetable protein sources are cereals such as barley, wheat, rye, oat, maize (corn), rice, triticale, and sorghum.
- the treatment according to the invention of proteins with at least one protease of the invention results in an increased solubilisation of proteins, as compared to the blank.
- At least 101%, or 102%, 103%, 104%, 105%, 106%, or at least 107% solubilised protein may be obtainable using the proteases of the invention, reference being had to the in vitro model of Example 8 herein.
- the term solubilisation of proteins basically means bringing protein(s) into solution. Such solubilisation may be due to protease-mediated release of protein from other components of the usually complex natural compositions such as feed. Solubilisation can be measured as an increase in the amount of soluble proteins, by reference to a sample with no protease treatment (see Example 8).
- the treatment according to the invention of proteins with at least one protease of the invention results in an increased digestibility of proteins, as compared to the blank.
- At least 101%, or 102%, 103%, 104%, 105%, 106%, 107%, 108%, 109%, 110%, 111%, 112%, 113%, 114%, 115%, or at least 116% digestible protein may be obtainable using the proteases of the invention, reference being had to the in vitro model of Example 8 herein.
- the protease(s) in question is affecting (or acting on, or exerting its solubilising influence on) the proteins, such as vegetable proteins or protein sources.
- the protein or protein source is typically suspended in a solvent, eg an aqueous solvent such as water, and the pH and temperature values are adjusted paying due regard to the characteristics of the enzyme in question.
- the treatment may take place at a pH-value at which the activity of the actual protease is at least 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, or at least 90%.
- the treatment may take place at a temperature at which the activity of the actual protease is at least 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, or at least 90%.
- the above percentage activity indications are relative to the maximum activities.
- the enzymatic reaction is continued until the desired result is achieved, following which it may or may not be stopped by inactivating the enzyme, e.g. by a heat-treatment step.
- the protease action is sustained, meaning e.g. that the protease is added to the proteins, but its solubilising influence is so to speak not switched on until later when desired, once suitable solubilising conditions are established, or once any enzyme inhibitors are inactivated, or whatever other means could have been applied to postpone the action of the enzyme.
- the treatment is a pre-treatment of animal feed or proteins for use in animal feed, i.e. the proteins are solubilised before intake.
- improving the nutritional value of an animal feed means improving the availability of the proteins, thereby leading to increased protein extraction, higher protein yields, and/or improved protein utilisation.
- the nutritional value of the feed is therefore increased, and the growth rate and/or weight gain and/or feed conversion (i.e. the weight of ingested feed relative to weight gain) of the animal is/are improved.
- the protease can be added to the feed in any form, be it as a relatively pure protease, or in admixture with other components intended for addition to animal feed, i.e. in the form of animal feed additives, such as the so-called pre-mixes for animal feed.
- compositions for use in animal feed such as animal feed, and animal feed additives, e.g. premixes.
- the animal feed additives of the invention contain at least one fat-soluble vitamin, and/or at least one water soluble vitamin, and/or at least one trace mineral, and/or at least one macro mineral.
- feed-additive ingredients are colouring agents, e.g. carotenoids such as beta-carotene, astaxanthin, and lutein; aroma compounds; stabilisers; antimicrobial peptides; polyunsaturated fatty acids; reactive oxygen generating species; and/or at least one other enzyme selected from amongst phytase (EC 3.1.3.8 or 3.1.3.26); xylanase (EC 3.2.1.8); galactanase (EC 3.2.1.89); alpha-galactosidase (EC 3.2.1.22); protease (EC 3.4.-.- ), phospholipase A1 (EC 3.1.1.32); phospholipase A2 (EC 3.1.1.4); lysophospholipase (EC 3.1.1.5); phospholipase C (3.1.4.3); phospholipase D (EC 3.1.4.4); amylase such as, for example, alpha-amylase (EC 3.2.1.1
- these other enzymes are well-defined (as defined above for protease preparations).
- antimicrobial peptides examples include CAP18, Leucocin A, Tritrpticin, Protegrin-1, Thanatin, Defensin, Lactoferrin, Lactoferricin, and Ovispirin such as Novispirin (Robert Lehrer, 2000), Plectasins, and Statins, including the compounds and polypeptides disclosed in WO 03/044049 and WO 03/048148 , as well as variants or fragments of the above that retain antimicrobial activity.
- AFP's antifungal polypeptides
- Aspergillus giganteus and Aspergillus niger peptides, as well as variants and fragments thereof which retain antifungal activity, as disclosed in WO 94/01459 and WO 02/090384 .
- polyunsaturated fatty acids are C18, C20 and C22 polyunsaturated fatty acids, such as arachidonic acid, docosohexaenoic acid, eicosapentaenoic acid and gamma-linoleic acid.
- reactive oxygen generating species are chemicals such as perborate, persulphate, or percarbonate; and enzymes such as an oxidase, an oxygenase or a syntethase.
- the animal feed additive of the invention is intended for being included (or prescribed as having to be included) in animal diets or feed at levels of 0.01 to 10.0%; more particularly 0.05 to 5.0%; or 0.2 to 1.0% (% meaning g additive per 100 g feed). This is so in particular for premixes.
- fat-soluble vitamins are vitamin A, vitamin D3, vitamin E, and vitamin K, e.g. vitamin K3.
- water-soluble vitamins are vitamin B12, biotin and choline, vitamin B1, vitamin B2, vitamin B6, niacin, folic acid and panthothenate, e.g. Ca-D-panthothenate.
- trace minerals are manganese, zinc, iron, copper, iodine, selenium, and cobalt.
- macro minerals are calcium, phosphorus and sodium.
- Nutritional requirement means that these components should be provided in the diet in the concentrations indicated.
- the animal feed additive of the invention comprises at least one of the individual components specified in Table A of WO 01/58275 .
- At least one means either of, one or more of, one, or two, or three, or four and so forth up to all thirteen, or up to all fifteen individual components. More specifically, this at least one individual component is included in the additive of the invention in such an amount as to provide an in-feed-concentration within the range indicated in column four, or column five, or column six of Table A.
- the animal feed additive of the invention comprises at least one of the below vitamins, preferably to provide an in-feed-concentration within the ranges specified in the below table I (for piglet diets, and broiler diets, respectively).
- Table I Typical vitamin recommendations Vitamin Piglet diet Broiler diet Vitamin A 10,000-15,000 IU/kg feed 8-12,500 IU/kg feed Vitamin D3 1800-2000 IU/kg feed 3000-5000 IU/kg feed Vitamin E 60-100 mg/kg feed 150-240 mg/kg feed Vitamin K3 2-4 mg/kg feed 2-4 mg/kg feed Vitamin B1 2-4 mg/kg feed 2-3 mg/kg feed Vitamin B2 6-10 mg/kg feed 7-9 mg/kg feed Vitamin B6 4-8 mg/kg feed 3-6 mg/kg feed Vitamin B12 0.03-0.05 mg/kg feed 0.015-0.04 mg/kg feed Niacin (Vitamin B3) 30-50 mg/kg feed 50-80 mg/kg feed Pantothenic acid 20-40 mg/kg feed 10-18 mg/kg feed Folic acid 1-2 mg/
- the present invention also relates to animal feed compositions.
- Animal feed compositions or diets have a relatively high content of protein.
- Poultry and pig diets can be characterised as indicated in Table B of WO 01/58275 , columns 2-3.
- Fish diets can be characterised as indicated in column 4 of this Table B. Furthermore such fish diets usually have a crude fat content of 200-310 g/kg.
- WO 01/58275 corresponds to US 09/779334 which is hereby incorporated by reference.
- An animal feed composition according to the invention has a crude protein content of 50-800 g/kg, and furthermore comprises at least one protease as claimed herein.
- the animal feed composition of the invention has a content of metabolisable energy of 10-30 MJ/kg; and/or a content of calcium of 0.1-200 g/kg; and/or a content of available phosphorus of 0.1-200 g/kg; and/or a content of methionine of 0.1-100 g/kg; and/or a content of methionine plus cysteine of 0.1-150 g/kg; and/or a content of lysine of 0.5-50 g/kg.
- the content of metabolisable energy, crude protein, calcium, phosphorus, methionine, methionine plus cysteine, and/or lysine is within any one of ranges 2, 3, 4 or 5 in Table B of WO 01/58275 (R. 2-5).
- the nitrogen content is determined by the Kjeldahl method ( A.O.A.C., 1984, Official Methods of Analysis 14th ed., Association of Official Analytical Chemists, Washington DC ).
- Metabolisable energy can be calculated on the basis of the NRC publication Nutrient requirements in swine, ninth revised edition 1988, subcommittee on swine nutrition, committee on animal nutrition, board of agriculture, national research council. National Academy Press, Washington, D.C., pp. 2-6, and the European Table of Energy Values for Poultry Feed-stuffs, Spelderholt centre for poultry research and extension, 7361 DA Beekbergen, The Netherlands. Grafisch bedrijf Ponsen & looijen bv, Wageningen. ISBN 90-71463-12-5.
- the dietary content of calcium, available phosphorus and amino acids in complete animal diets is calculated on the basis of feed tables such as Veevoedertabel 1997, gegevens over chemische samenstelling, verteerbaarheid en voederwaarde van voedermiddelen, Central Veevoederbureau, Runderweg 6, 8219 pk Lelystad. ISBN 90-72839-13-7.
- the animal feed composition of the invention contains at least one vegetable prootein as defined above. It may also contain animal protein, such as Meat and Bone Meal, and/or Fish Meal, typically in an amount of 0-25%.
- the animal feed composition of the invention contains 0-80% maize; and/or 0-80% sorghum; and/or 0-70% wheat; and/or 0-70% Barley; and/or 0-30% oats; and/or 0-40% soybean meal; and/or 0-25% fish meal; and/or 0-25% meat and bone meal; and/or 0-20% whey.
- Animal diets can e.g. be manufactured as mash feed (non pelleted) or pelleted feed.
- the milled feed-stuffs are mixed and sufficient amounts of essential vitamins and minerals are added according to the specifications for the species in question.
- Enzymes can be added as solid or liquid enzyme formulations.
- a solid enzyme formulation is typically added before or during the mixing step; and a liquid enzyme preparation is typically added after the pelleting step.
- the enzyme may also be incorporated in a feed additive or premix.
- the final enzyme concentration in the diet is within the range of 0.01-200 mg enzyme protein per kg diet, for example in the range of 0.5-25 mg enzyme protein per kg animal diet.
- the protease should of course be applied in an effective amount, i.e. in an amount adequate for improving solubilisation, digestibility, and/or improving nutritional value of feed. It is at present contemplated that the enzyme is administered in one or more of the following amounts (dosage ranges): 0.01-200; 0.01-100; 0.5-100; 1-50; 5-100; 10-100; 0.05-50; or 0.10-10 - all these ranges being in mg protease protein per kg feed (ppm).
- the protease is purified from the feed composition, and the specific activity of the purified protease is determined using a relevant assay (see under protease activity, substrates, and assays).
- the protease activity of the feed composition as such is also determined using the same assay, and on the basis of these two determinations, the dosage in mg protease protein per kg feed is calculated.
- the protease of the invention may be added to and thus become a component of a detergent composition.
- the detergent composition of the invention may for example be formulated as a hand or machine laundry detergent composition including a laundry additive composition suitable for pre-treatment of stained fabrics and a rinse added fabric softener composition, or be formulated as a detergent composition for use in general household hard surface cleaning operations, or be formulated for hand or machine dishwashing operations.
- the invention provides a detergent additive comprising the protease of the invention.
- the detergent additive as well as the detergent composition may comprise one or more other enzymes such as another protease, such as alkaline proteases from Bacillus, a lipase, a cutinase, an amylase, a carbohydrase, a cellulase, a pectinase, a mannanase, an arabinase, a galactanase, a xylanase, an oxidase, e.g., a laccase, and/or a peroxidase.
- another protease such as alkaline proteases from Bacillus, a lipase, a cutinase, an amylase, a carbohydrase, a cellulase, a pectinase, a mannanase, an arabinase, a
- the properties of the chosen enzyme(s) should be compatible with the selected detergent, (i.e. pH-optimum, compatibility with other enzymatic and non-enzymatic ingredients, etc.), and the enzyme(s) should be present in effective amounts.
- Suitable lipases include those of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Examples of useful lipases include lipases from Humicola (synonym Thermomyces ), e.g. from H. lanuginosa ( T. lanuginosus ) as described in EP 258068 and EP 305216 or from H. insolens as described in WO 96/13580 , a Pseudomonas lipase, e.g. from P. alcaligenes or P. pseudoalcaligenes ( EP 218272 ), P . cepacia ( EP 331376 ), P. stutzeri ( GB 1,372,034 ), P.
- lipase variants such as those described in WO 92/05249 , WO 94/01541 , EP 407225 , EP 260105 , WO 95/35381 , WO 96/00292 , WO 95/30744 , WO 94/25578 , WO 95/14783 , WO 95/22615 , WO 97/04079 and WO 97/07202 .
- Preferred commercially available lipase enzymes include Lipolase TM and Lipolase Ultra TM (Novozymes A/S).
- suitable amylases alpha- and/or beta-
- Amylases include, for example, alpha-amylases obtained from Bacillus, e.g. a special strain of B. licheniformis, described in more detail in GB 1,296,839 .
- Examples of useful amylases are the variants described in WO 94/02597 , WO 94/18314 , WO 95/26397 , WO 96/23873 , WO 97/43424 , WO 00/60060 , and WO 01/66712 , especially the variants with substitutions in one or more of the following positions: 15, 23, 105, 106, 124, 128, 133, 154, 156, 181, 188, 190, 197, 202, 208, 209, 243, 264, 304, 305, 391, 408, and 444.
- amylases are Natalase TM , Supramyl TM , Stainzyme TM , Duramyl TM , Termamyl TM , Fungamyl TM and BAN TM (Novozymes A/S), Rapidase TM and Purastar TM (from Genencor International Inc.).
- Suitable cellulases include those of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Suitable cellulases include cellulases from the genera Bacillus, Pseudomonas, Humicola, Fusarium, Thielavia, Acremonium, e.g. the fungal cellulases produced from Humicola insolens, Myceliophthora thermophila and Fusarium oxysporum disclosed in US 4,435,307 , US 5,648,263 , US 5,691,178 , US 5,776,757 and WO 89/09259 . Especially suitable cellulases are the alkaline or neutral cellulases having colour care benefits.
- cellulases examples include cellulases described in EP 0 495257 , EP 531372 , WO 96/11262 , WO 96/29397 , WO 98/08940 .
- Other examples are cellulase variants such as those described in WO 94/07998 , EP 0 531 315 , US 5,457,046 , US 5,686,593 , US 5,763,254 , WO 95/24471 , WO 98/12307 and WO 99/01544 .
- cellulases include Celluzyme TM , and Carezyme TM (Novozymes A/S), Clazinase TM , and Puradax HA TM (Genencor International Inc.), and KAC-500(B) TM (Kao Corporation).
- Suitable peroxidases/oxidases include those of plant, bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Examples of useful peroxidases include peroxidases from Coprinus, e.g. from C . cinereus, and variants thereof as those described in WO 93/24618 , WO 95/10602 , and WO 98/15257 . Commercially available peroxidases include Guardzyme TM (Novozymes).
- the detergent enzyme(s) may be included in a detergent composition by adding separate additives containing one or more enzymes, or by adding a combined additive comprising all of these enzymes.
- a detergent additive of the invention i.e. a separate additive or a combined additive, can be formulated e.g. as a granulate, a liquid, a slurry, etc.
- Preferred detergent additive formulations are granulates, in particular non-dusting granulates, liquids, in particular stabilized liquids, or slurries.
- Non-dusting granulates may be produced, e.g., as disclosed in US 4,106,991 and 4,661,452 and may optionally be coated by methods known in the art.
- waxy coating materials are poly(ethylene oxide) products (polyethyleneglycol, PEG) with mean molar weights of 1000 to 20000; ethoxylated nonylphenols having from 16 to 50 ethylene oxide units; ethoxylated fatty alcohols in which the alcohol contains from 12 to 20 carbon atoms and in which there are 15 to 80 ethylene oxide units; fatty alcohols; fatty acids; and mono- and di- and triglycerides of fatty acids.
- film-forming coating materials suitable for application by fluid bed techniques are given in GB 1483591 .
- Liquid enzyme preparations may, for instance, be stabilized by adding a polyol such as propylene glycol, a sugar or sugar alcohol, lactic acid or boric acid according to established methods.
- Protected enzymes may be prepared according to the method disclosed in EP 238216 .
- the detergent composition of the invention may be in any convenient form, e.g., a bar, a tablet, a powder, a granule, a paste or a liquid.
- a liquid detergent may be aqueous, typically containing up to 70 % water and 0-30 % organic solvent, or non-aqueous.
- the detergent composition comprises one or more surfactants, which may be non-ionic including semi-polar and/or anionic and/or cationic and/or zwitterionic.
- the surfactants are typically present at a level of from 0.1% to 60% by weight.
- the detergent When included therein the detergent will usually contain from about 1% to about 40% of an anionic surfactant such as linear alkylbenzenesulfonate, alpha-olefinsulfonate, alkyl sulfate (fatty alcohol sulfate), alcohol ethoxysulfate, secondary alkanesulfonate, alpha-sulfo fatty acid methyl ester, alkyl- or alkenylsuccinic acid or soap.
- an anionic surfactant such as linear alkylbenzenesulfonate, alpha-olefinsulfonate, alkyl sulfate (fatty alcohol sulfate), alcohol ethoxysulfate, secondary alkanesulfonate, alpha-sulfo fatty acid methyl ester, alkyl- or alkenylsuccinic acid or soap.
- the detergent When included therein the detergent will usually contain from about 0.2% to about 40% of a non-ionic surfactant such as alcohol ethoxylate, nonylphenol ethoxylate, alkylpolyglycoside, alkyldimethylamineoxide, ethoxylated fatty acid monoethanolamide, fatty acid monoethanolamide, polyhydroxy alkyl fatty acid amide, or N-acyl N-alkyl derivatives of glucosamine (“glucamides").
- a non-ionic surfactant such as alcohol ethoxylate, nonylphenol ethoxylate, alkylpolyglycoside, alkyldimethylamineoxide, ethoxylated fatty acid monoethanolamide, fatty acid monoethanolamide, polyhydroxy alkyl fatty acid amide, or N-acyl N-alkyl derivatives of glucosamine (“glucamides”).
- glucamides N-acyl N-alkyl derivatives of glucosamine
- the detergent may contain 0-65 % of a detergent builder or complexing agent such as zeolite, diphosphate, triphosphate, phosphonate, carbonate, citrate, nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, alkyl- or alkenylsuccinic acid, soluble silicates or layered silicates (e.g. SKS-6 from Hoechst).
- a detergent builder or complexing agent such as zeolite, diphosphate, triphosphate, phosphonate, carbonate, citrate, nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, alkyl- or alkenylsuccinic acid, soluble silicates or layered silicates (e.g. SKS-6 from Hoechst).
- the detergent may comprise one or more polymers.
- examples are carboxymethylcellulose, poly(vinylpyrrolidone), poly (ethylene glycol), poly(vinyl alcohol), poly(vinylpyridine-N-oxide), poly(vinylimidazole), polycarboxylates such as polyacrylates, maleic/acrylic acid copolymers and lauryl methacrylate/acrylic acid copolymers.
- the detergent may contain a bleaching system which may comprise a H 2 O 2 source such as perborate or percarbonate which may be combined with a peracid-forming bleach activator such as tetraacetylethylenediamine or nonanoyloxybenzenesulfonate.
- a bleaching system may comprise peroxyacids of e.g. the amide, imide, or sulfone type.
- the enzyme(s) of the detergent composition of the invention may be stabilized using conventional stabilizing agents, e.g., a polyol such as propylene glycol or glycerol, a sugar or sugar alcohol, lactic acid, boric acid, or a boric acid derivative, e.g., an aromatic borate ester, or a phenyl boronic acid derivative such as 4-formylphenyl boronic acid, and the composition may be formulated as described in e.g. WO 92/19709 and WO 92/19708 .
- a polyol such as propylene glycol or glycerol
- a sugar or sugar alcohol lactic acid, boric acid, or a boric acid derivative, e.g., an aromatic borate ester, or a phenyl boronic acid derivative such as 4-formylphenyl boronic acid
- the detergent may also contain other conventional detergent ingredients such as e.g. fabric conditioners including clays, foam boosters, suds suppressors, anti-corrosion agents, soil-suspending agents, anti-soil redeposition agents, dyes, bactericides, optical brighteners, hydrotropes, tarnish inhibitors, or perfumes.
- fabric conditioners including clays, foam boosters, suds suppressors, anti-corrosion agents, soil-suspending agents, anti-soil redeposition agents, dyes, bactericides, optical brighteners, hydrotropes, tarnish inhibitors, or perfumes.
- any enzyme in particular the enzyme of the invention, may be added in an amount corresponding to 0.01-100 mg of enzyme protein per liter of wash liqour, preferably 0.05-5 mg of enzyme protein per liter of wash liqour, in particular 0.1-1 mg of enzyme protein per liter of wash liqour.
- the enzyme of the invention may additionally be incorporated in the detergent formulations disclosed in WO 97/07202 .
- the invention also relates to the following particular embodiments, in what follows numbered 1-21 and 42-121:
- Strain DSM 15649 was isolated in 2001 from a soil sample from Denmark.
- Stonevillei strain DSM 43235 was also deposited at other depositary institutions as follows: ATCC 23219, IMRU 1250, NCTC 10489.
- the coding region for the pro-mature protease L1a (nucleotides 88-1143 of SEQ ID NO: 1) was amplified with the following primers 1424 and 1485 on genomic DNA isolated from Nocardiopsis josonvillei subsp. josonvillei DSM 43235:
- the coding region for the pro-mature protease L1b (nucleotides 88-1149 of SEQ ID NO: 3) was amplified with the following primers 1751 and 1753 on genomic DNA isolated from from Nocardiopsis prasina DSM15649:
- the coding region for the pro-mature protease L1c (nucleotides 88-1149 of SEQ ID NO: 5) was amplified with the following primers 1755 and 1756 on genomic DNA isolated from Nocardiopsis prasina DSM14010:
- L1a, L1b, and L1c polynucleotides were fused, by PCR, in frame to a heterologous DNA fragment encoding a Sav signal peptide (SEQ ID NO: 13).
- the genes were expressed under the control of a triple promoter system (as described in WO 99/43835 ), consisting of the promoters from Bacillus licheniformis alpha-amylase gene (amyL), Bacillus amyloliquefaciens alpha-amylase gene (amyQ), and the Bacillus thuringiensis cryIIIA promoter including stabilizing sequence.
- Chloramphenicol acetyl-transferase was used as marker (described in eg. Diderichsen,B.; Poulsen,G.B.; Joergensen,S.T.; A useful cloning vector for Bacillus subtilis. Plasmid 30:312 (1993 )).
- Chloramphenicol resistant transformants were checked for protease activity on 1% skim milk LB-PG agar plates (supplemented with 6 ⁇ g/ml chloramphenicol). Some protease positive colonies were further analyzed by DNA sequencing of the insert to confirm the correct DNA sequence, and one strain for each construct was selected.
- Each of the transformed Bacillus subtilis host strains were fermented on a rotary shaking table (250 r.p.m.) in 500 ml baffled Erlenmeyer flasks containing 100 ml PS-1 medium supplemented with 6 ⁇ g/ml chloramphenicol, at 37°C for 16 hours, and at 26°C for extra 4 days.
- protease encoding gene (nucleotides 88-1152 of SEQ ID NO: 7) was isolated from Nocardiopsis sp. DSM 16424 by the procedure described in Example 1, except for the use of the following primers:
- the corresponding protease (SEQ ID NO: 8) was designated L2a.
- a Bacillus subtilis host strain designated Sav-L2a was constructed, as also generally described in Example 1, and a chloramphenicol resistant, protease-positive colony selected and analyzed by DNA sequencing of the insert.
- pro-forms of two additional protease encoding genes were isolated from Nocardiopsis alkaliphila DSM 44657, and from Nocardiopsis lucentensis DSM 44048, respectively, by the procedure described in Example 1, except for the use of primers 1728 and 1763; and 1747 and 1749, respectively:
- the corresponding proteases (SEQ ID NO: 10 and 12, respectively) were designated L2b, and L2c, respectively.
- Bacillus subtilis host strains designated Sav-L2b and Sav-L2c, respectively, are constructed, as also generally described in Example 1, and chloramphenicol resistant, protease-positive colonies are selected and analyzed by DNA sequencing of the inserts.
- a Protazyme AK tablet is suspended in 2.0ml 0.01% Triton X-100 by gentle stirring. 500 ⁇ l of this suspension and 500 ⁇ l assay buffer are mixed in an Eppendorf tube and placed on ice. 20 ⁇ l protease sample (diluted in 0.01% Triton X-100) is added. The assay is initiated by transferring the Eppendorf tube to an Eppendorf thermomixer, which is set to the assay temperature. The tube is incubated for 15 minutes on the Eppendorf thermomixer at its highest shaking rate (1400 rpm). The incubation is stopped by transferring the tube back to the ice bath.
- OD 650 is read as a measure of protease activity.
- a buffer blind is included in the assay (instead of enzyme).
- the transformed Bacillus host expressing the L1 a protease described in Example 1 was fermented as also described in Example 1, but at 26°C for 6 days.
- the culture broth was centrifuged (20000 x g, 20 min) and the supernatants were carefully decanted from the precipitates.
- the combined supernatants were filtered through a Seitz EKS plate in order to remove the rest of the Bacillus host cells.
- the EKS filtrate was transferred to 50mM H 3 BO 3 , 5mM succinic acid, 1mM CaCl 2 , pH 7 on a G25 sephadex column.
- Solid ammonium sulfate was added to the enzyme solution from the G25 sephadex column to give a 1.6M final (NH 4 ) 2 SO 4 concentration in the enzyme solution.
- the enzyme solution was mixed gently with a magnetic stirrer during the (NH 4 ) 2 SO 4 addition and the stirring was continued for 30 minutes after the addition to bring the system in equilibrium. Then the enzyme solution was applied to a Butyl Toyopearl column equilibrated in 100mM H 3 BO 3 , 10mM succinic acid, 2mM CaCl 2 , 1.6M (NH 4 ) 2 SO 4 , pH 7.
- protease was eluted with a linear (NH 4 ) 2 SO 4 gradient (1.6 to 0M) in the same buffer.
- Protease containing fractions were pooled and transferred to 20mM HEPES, pH 8 on a G25 sephadex column and applied to a Q sepharose FF column equilibrated in the same buffer.
- the protease was eluted with a linear NaCl gradient (0 to 0.5M) in the same buffer.
- Fractions from the column were analysed for protease activity (using the Suc-AAPF-pNA assay at pH 9) and active fractions were further analysed by SDS-PAGE. Fractions with only one band (as judged by a coomassie stained SDS-PAGE gel) were pooled to provide the purified preparation which was used for further characterization.
- the L1a protease was characterized as described below, in comparison with the other protease derived from Nocardiopsis josonvillei subsp. josonvillei DSM 43235, prepared as described in WO 2004/111220 (in what follows for short designated "the L2 protease").
- the pNA assay was used for obtaining the pH-activity profile as well as the pH-stability profile.
- the protease was diluted 10x in the assay buffers and incubated for 2 hours at 37°C. After incubation the protease samples were transferred to the same pH (pH 9), before assay for residual activity, by dilution in the pH 9 assay buffer.
- the Protazyme AK assay was used for obtaining the temperature-activity profile at pH 9. The results are shown in Tables 1-3 below.
- Table 1 pH-activity profile pH L1a protease L2 protease 2 0.00 0.00 3 0.00 0.00 4 0.02 0.03 5 0.10 0.11 6 0.25 0.21 7 0.38 0.37 8 0.66 0.71 9 0.97 0.97 10 1.00 1.00 11 0.99 0.94 12 0.94 - Table 2: pH-stability profile pH L1a protease L2 protease 2.0 0.50 1.00 2.5 0.81 0.95 3.0 0.93 0.97 3.5 0.94 1.01 4.0 0.97 0.98 5.0 0.96 0.97 6.0 0.95 0.98 7.0 0.99 0.96 8.0 0.97 0.99 9.0 0.93 0.99 10.0 0.94 0.96 11.0 0.94 0.94 12.0 0.92 0.84 9.0 and after 2 hours at 5 °C 1.00 1.00 Table 3: Temperature activity profile temperature (°C) L1a protease L2 protease 15 0.11 0.01 25 0.17 0.01 37 0.30 0.03 50 0.58 0.09 60 0.90 0.19 70 1.00 0.63 80 0.34 1.00 90 - 0.35
- the purified protease preparation described in Example 4 was used for determination of the specific activity.
- the purity of the preparation was above 95% when analysed by SDS-PAGE (determined as described in Example 2A in WO 01/58275 ).
- the protease sample was divided in two. One part was analysed for protein content (mg/ml) by amino acid analysis, the other part was analysed for protease activity.
- the peptide bonds of the protease sample were subjected to acid hydrolysis, followed by separation and quantification of the released amino acids on a Biochrom 20 Plus Amino Acid Analyser, commercially available from Bie & Berntsen A/S, Sandbaekvej 5-7, DK-2610 Roedovre, Denmark, according to the manufacturer's instructions.
- the protein sample was dried in a vacuum centrifuge, resolved in 18.5% (vol/vol) HCl + 0.1% (vol/vol) phenol and incubated for 16hr at 110°C. After incubation, the sample was again dried in the vacuum centrifuge, resolved in loading buffer (0.2 M Na-Citrate, pH 2.2) and loaded onto the Biochrom 20 Plus Amino Acid Analyser.
- the hydrolysed sample was loaded onto a column of the cation-exchange resin UltroPac no. 8, Sodium-form, which is commercially available from Bie & Berntsen A/S, catalogue no. 80-2104-15. Buffers of varying pH (pH 1 to pH 8) and ionic strength were pumped through the column according to the manufacturer's instructions referred to above, to separate the various amino acids.
- the column temperature was accurately controlled, also according to the manufacturer's instructions (from 53°C to 92°C and back to 53°C) in order to ensure the required separation.
- the column eluent was mixed with ninhydrin reagent (Bie & Berntsen, catalogue no.
- TCA trichloroacetic acid
- the specific activity of the L1 a protease was 49.8 AU/g, as compared to the specific activity of the protease derived from Nocardiopsis sp. NRRL 18262 of 38.3 AU/g.
- the transformed Bacillus host expressing the L2a protease described in Example 2 was fermented as described in Example 1, but at 30°C for 5 days.
- the culture broth was centrifuged (20000 x g, 20 min) and the supernatants were carefully decanted from the precipitates.
- the combined supernatants were filtered through a Seitz EKS plate in order to remove the rest of the Bacillus host cells.
- the EKS filtrate was transferred to 50mM H 3 BO 3 , 5mM succinic acid, 1mM CaCl 2 , pH 7 on a G25 sephadex column and applied to a bacitracin silica column equilibrated in the same buffer.
- the protease was step-eluted with 100mM H 3 BO 3 , 10mM succinic acid, 2mM CaCl 2 , 1 M NaCl, 25% isopropanol, pH 7.
- the bacitracin eluate was transferred to 50mM H 3 BO 3 , 10mM CH 3 COOH, 1mM CaCl 2 , pH 4.5 on a G25 sephadex column and applied to a S sepharose HP column equilibrated in the same buffer.
- the protease was eluted with a linear NaCl gradient (0 to 0.5M) in the same buffer.
- Fractions from the column were analysed for protease activity (using the Protazyme AK assay at 37°C and pH 9) and active fractions were further analysed by SDS-PAGE. Fractions with only one band was (as judged by a coomassie stained SDS-PAGE gel), were pooled to provide the purified preparation which was used for further characterization.
- the L2a protease was characterized as described in Example 4 above, in comparison with a known protease derived from Nocardiopsis sp. NRRL 18262 (for short designated "Protease 10"). The results are shown in Tables 4-6 below.
- Table 4 pH-activity profile pH L2a protease Protease 10 2 0.00 - 3 0.00 0.00 4 0.02 0.02 5 0.10 0.07 6 0.22 0.21 7 0.41 0.44 8 0.75 0.67 9 0.97 0.88 10 0.99 1.00 11 1.00 0.93 12 0.85 - Table 5: pH-stability profile pH L2a protease Protease 10 2.0 0.67 0.78 2.5 0.93 1.00 3.0 0.95 1.03 3.5 0.96 0.98 4.0 0.97 0.99 5.0 0.94 1.02 6.0 0.95 1.00 7.0 0.97 1.01 8.0 0.96 0.98 9.0 0.95 0.99 10.0 0.96 0.99 11.0 0.90 0.86 12.0 0.60 - 9.0 and after 2 hours at 5 °C 1.00 1.00 Table 6: Temperature activity profile Temperature (°C) L2a protease Protease 10 15 0.02 0.02 25 0.02 0.02 37 0.05 0.07 50 0.13 0.20 60 0.31 0.51 70 0.79 1.00 80 1.00 0.39 90 0.28 -
- DSC was used to determine temperature stability at pH 7.0 of the L2a protease derived from Nocardiopsis sp. DSM 16424.
- the protease was purified as described in Example 6 and dialysed over night at 4°C against 10 mM sodium phosphate, 50 mM sodium chloride, pH 7.0 and run on a VP-DSC instrument (Micro Cal) with a constant scan rate of 1.5°C/min from 20 to 100°C. Data-handling was performed using the MicroCal Origin software.
- the resulting denaturation or melting temperature (T m or T d ), was 78.2°C.
- the T m for Protease 10 is 76.5°C.
- Example 8 Performance of the L2a Protease in a Monogastric In Vitro Digestion Model
- the performance of the purified L2a protease described in Example 6 was tested in an in vitro model simulating the digestion in monogastric animals, in comparison with the known protease derived from Nocardiopsis sp. NRRL 18262 ("Protease 10").
- the protease was tested for its ability to improve solubilisation and digestion of maize/-SBM (maize/-soybean meal) proteins.
- the in vitro system consisted of 18 flasks in which maize/- SBM substrate was initially incubated with HCl/pepsin - simulating gastric digestion - and subsequently with pancreatin - simulating intestinal digestion.
- protease enzyme protein (EP) is calculated on the basis of the A 280 values and the amino acid sequences (amino acid compositions) using the principles outlined in S.C.Gill & P.H. von Hippel, Analytical Biochemistry 182, 319-326, (1989 ).
- solubilised protein in supernatants from in vitro digested samples was estimated by quantifying crude protein (CP) using gel filtration HPLC. Supernatants were thawed, filtered through 0.45 ⁇ m polycarbonate filters and diluted (1:50, v/v) with H 2 O. Diluted samples were chromatographed by HPLC using a Superdex Peptide PE (7.5 x 300 mm) gel filtration column (Global). The eluent used for isocratic elution was 50 mM sodium phosphate buffer (pH 7.0) containing 150 mM NaCl. The total volume of eluent per run was 26 ml and the flow rate was 0.4 ml/min.
- the content of digested protein was estimated by integrating the chromatogram area corresponding to peptides and amino acids having a molecular mass of 1500 Dalton or below ( Savoie,L.; Gauthier,S.F. Dialysis Cell For The In-vitro Measurement Of Protein Digestibility. J. Food Sci. 1986, 51, 494-498 ; Babinszky,L.; Van,D.M.J.M.; Boer,H.; Den,H.L.A. An In-vitro Method for Prediction of The Digestible Crude Protein Content in Pig Feeds. J. Sci. Food Agr. 1990, 50, 173-178 ; Boisen,S.; Eggum,B.O.
- An animal feed additive comprising protease L2a of the invention, in the form of a vitamins and mineral premix, is composed as shown in Table 8 below.
- the vitamins and the carotenoids are commercially available from DSM Nutritional Products. All amounts are in g/kg.
- Table 8 Premix composition Vitamin A ROVIMIX A 500 4.00 Vitamin D3 ROVIMIX D3 500 1.00 Vitamin E ROVIMIX E 50 Ads 8.00 Vitamin B2 ROVIMIX B2 80-SD 1.0 CAROPHYLL Yellow 10.0 Choline chloride 50%, min. 300.0 Minerals Mn Oxide 60.0 Zn Oxide 12.0 Fe Sulphate monohydrate 20.0 Cu Oxide 2.0 Co Sulphate 0.2 Enzyme Protease L2a (enzyme protein) 10.0 Wheat middlings 571.8
- the Premix of Table 8 is included in a diet for layers with a composition as shown in Table 9 below. The amount of each ingredient is indicated in % (w/w). The concentration in the diet of the L2a protease is 100 mg protease enzyme protein per kg of the diet. Table 9: Diet for layers Maize 55.00 Wheat 10.00 Oat 7.50 Soya 20.00 Limestone 7.50 Premix of Table 8 1.00
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- 2005-06-17 AT AT05748647T patent/ATE541034T1/de active
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- 2005-06-17 CN CNA2005800277865A patent/CN101014704A/zh active Pending
- 2005-06-17 BR BRPI0512341-0A patent/BRPI0512341A/pt not_active Application Discontinuation
- 2005-06-17 WO PCT/DK2005/000396 patent/WO2005123911A2/fr active Application Filing
- 2005-06-17 EP EP05748647A patent/EP1766001B1/fr active Active
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2011
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WO2005123911A2 (fr) | 2005-12-29 |
EP1766001B1 (fr) | 2012-01-11 |
BRPI0512341A (pt) | 2008-03-04 |
EP2258839B1 (fr) | 2015-06-03 |
US20120321746A1 (en) | 2012-12-20 |
JP2011167205A (ja) | 2011-09-01 |
MXPA06014649A (es) | 2007-03-12 |
EP1766001A2 (fr) | 2007-03-28 |
AU2010257357A1 (en) | 2011-01-20 |
US9279115B2 (en) | 2016-03-08 |
AU2010257357B2 (en) | 2013-05-02 |
EP2258839A1 (fr) | 2010-12-08 |
ES2380105T3 (es) | 2012-05-08 |
AU2005254611A1 (en) | 2005-12-29 |
ES2545494T3 (es) | 2015-09-11 |
WO2005123911A3 (fr) | 2006-02-09 |
JP5623691B2 (ja) | 2014-11-12 |
JP2008503209A (ja) | 2008-02-07 |
US8357408B2 (en) | 2013-01-22 |
CA2591858C (fr) | 2015-05-05 |
ATE541034T1 (de) | 2012-01-15 |
US20120321747A1 (en) | 2012-12-20 |
US20080286415A1 (en) | 2008-11-20 |
US9279114B2 (en) | 2016-03-08 |
CA2591858A1 (fr) | 2005-12-29 |
CN101014704A (zh) | 2007-08-08 |
AU2005254611B2 (en) | 2010-09-23 |
US20160138000A1 (en) | 2016-05-19 |
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